Automatic continuous alkali liquor preparation system suitable for large-scale baking soda production

Abstract

The utility model discloses an automatic continuous alkali liquor preparation system suitable for large-scale baking soda production, and belongs to the technical field of chemical engineering. The device comprises a liquid storage device and a plurality of preparation units, wherein the preparation units are connected in parallel; each preparation unit comprises a stock bin, a variable-frequency spiral conveyor and a preparation tank which are connected in sequence; a mother liquor raw material conveying pipeline is connected into the liquid storage device, and a stored liquid conveying pipeline is connected out of the liquid storage device; the stock bin of each preparation unit is connected with a solid raw material conveying branch line, an inlet of the preparation tank of each preparation unit is connected with the liquid storage conveying pipeline through a liquid storage conveying branch line, an outlet of the preparation tank of each preparation unit is connected with a prepared liquid conveying branch line, and each prepared liquid conveying branch line is provided with an outlet control valve used for controlling output of a sodium carbonate solution. And each liquid preparation conveying branch line is connected to a downstream user device. The sodium carbonate solution output device can stably and continuously output sodium carbonate solution meeting the requirements for preparing sodium bicarbonate, and manpower consumption is reduced to the maximum extent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical technology, relates to the field of baking soda production technology, and specifically relates to an automatic continuous lye preparation system suitable for large-scale baking soda production. BACKGROUND

[0002] Baking soda, also known as sodium bicarbonate, is a white crystalline powder alkaline salt substance with a molecular formula of NaHCO3. Its main application fields include baking food making, cleaning agent production, pharmaceutical industry, and environmental protection. Baking soda is commonly used as a leavening agent in the baking field, which can make the dough expand and become soft; in cleaning agents, baking soda has the functions of stain removal, deodorization, and sterilization, and is widely used in household cleaning and health care. In addition, baking soda can also be used as an acid neutralizer and a buffer. Due to its wide application in multiple fields, the production and research of baking soda have important significance and social benefits.

[0003] In the prior art, the baking soda production method is mainly the soda ash solution carbonation method (heavy carbonation), and the chemical reaction formula is as follows:

[0004] Na2CO3 (aq) + CO2 (g) + H2O (l) → 2 NaHCO3 (s)

[0005] The general process is as follows: first, mix high-temperature soda ash powder with mother liquor to prepare a sodium carbonate solution with a certain concentration; then, pump the prepared soda lye into a clarifying tank for clarification and filtration, and then pump it into the upper part of the carbonation tower, and perform carbonation reaction with carbon dioxide at a certain temperature to generate sodium bicarbonate crystals; finally, through separation, drying, and other steps, baking soda products are obtained. The baking soda produced by this process has good quality, high purity, and few impurities, and is usually constructed in conjunction with a soda production device.

[0006] In the production process of baking soda, the preparation of soda lye is one of the important operation units. In the past, the production scale of baking soda was small, and the lye preparation was prepared by manual preparation method. However, with the increasing scale of baking soda construction, if the original backward preparation method is still used, the labor intensity of workers on site is high, the labor cost is high, and the lye index cannot be stably guaranteed. At present, with the increasing labor cost, it is of great practical significance and economic value to develop an automatic continuous lye preparation system that does not depend on manual work and has stable production indexes. UTILITY MODEL CONTENTS

[0007] The utility model aims to provide an automatic continuous lye preparation system suitable for large-scale baking soda production, which solves the technical problems of high labor intensity, high labor cost, and unstable quality in the manual preparation of soda lye in the prior art.

[0008] To achieve the above object, the utility model adopts the technical scheme as follows:

[0009] The utility model discloses a suitable for automatic continuous lye preparation system of large -scale baking soda production, including liquid storage device, the preparation unit of a plurality of who are connected to the liquid storage device, and each preparation unit is parallelly connected between the liquid storage device and downstream user device.

[0010] Each preparation unit includes the bin, frequency conversion spiral conveyor and preparation tank who are connected in turn.

[0011] The liquid storage device is connected with mother liquor raw material delivery pipeline, and the liquid storage delivery pipeline is connected.

[0012] The bin of each preparation unit is connected with solid raw material delivery branch line, the inlet of the preparation tank of each preparation unit is connected with the liquid storage delivery pipeline through the liquid storage delivery branch line, the outlet of the preparation tank of each preparation unit is connected with the liquid delivery branch line, and the outlet control valve for controlling soda solution output is arranged on each liquid delivery branch line.

[0013] Further, the liquid storage delivery branch line of each preparation unit is sequentially provided with a mother liquor flow meter and a mother liquor proportional control adjusting valve in the liquid flow direction, and the mother liquor proportional control adjusting valve is connected with the mother liquor flow meter and the frequency conversion spiral conveyor.

[0014] Further, the preparation tank of each preparation unit is connected with a liquid level meter for detecting the liquid level of the preparation tank, and the liquid level meter is connected with the frequency conversion spiral conveyor and the mother liquor proportional control adjusting valve.

[0015] Further, the preparation tank of each preparation unit is connected with an online pH meter for detecting the pH value of the soda solution prepared by the preparation tank and an online density instrument for detecting the density of the soda solution.

[0016] Further, the preparation tank of each preparation unit is provided with a stirrer.

[0017] Further, the preparation tank of each preparation unit is provided with a heating coil.

[0018] Further, the bin of each preparation unit is connected with a weighing instrument, the solid raw material delivery branch line of each preparation unit is provided with a plug valve near the bin inlet portion, and the weighing instrument of each preparation unit is connected with the plug valve.

[0019] Further, the liquid storage device is provided with an external heater, the tube of the external heater is connected with the liquid storage device through a heating pipeline, a temperature adjusting controller is arranged on the heating pipeline, the shell of the external heater is connected with a heating medium delivery pipeline, a heating medium control valve is arranged on the heating medium delivery pipeline, and the temperature adjusting controller is connected with the heating medium control valve.

[0020] Further, the number of the preparation units is greater than or equal to 2, and each preparation unit is connected in parallel between the liquid storage device and the downstream user device.

[0021] Further, the liquid preparation delivery line is further included, and each liquid preparation delivery branch line is connected to the downstream user device through the liquid preparation delivery line.

[0022] Compared with the prior art, the alkali solution preparation system has the following beneficial effects:

[0023] The alkali solution preparation system is designed scientifically and has a clever design, realizes automatic performance of the alkali solution preparation process and the preparation unit switching process, and can stably and continuously output the required soda solution for preparation of baking soda, thereby greatly reducing labor consumption.

[0024] The number of the preparation units and the alkali solution preparation amount of each unit can be adjusted and determined according to the total amount of the alkali solution demand, and the adjustment and determination are flexible and convenient.

[0025] The mother solution supply adopts an external heater to supplement the heat required by the alkali solution preparation, and to maintain the temperature of the mother solution supplied to the preparation tank.

[0026] The alkali solution preparation system further includes an on-line pH meter, a density meter and other instruments, and automatic control valves and variable frequency conveyors and other equipment, so as to ensure the stability of the prepared soda solution index.

[0027] The preparation tank is provided with a built-in stirrer and a heating coil, and is simultaneously provided with an exhaust hood with an exhaust function, so as to timely exhaust the decomposed carbon dioxide and steam.

[0028] The prepared soda solution of the alkali solution preparation system is not only suitable for preparation of baking soda, but also can be used in a salt water refining process and other industrial processes requiring the soda solution as a chemical.

[0029] The alkali solution preparation system is not only suitable for preparation of the soda solution, but also suitable for preparation of other easily soluble solid solutions. BRIEF DESCRIPTION OF DRAWINGS

[0030] ATTACHMENT Figure 1 The figure is a structural schematic view of the alkali solution preparation system.

[0031] Corresponding names of the figure marks are as follows:

[0032] 1-liquid storage device, 2-first silo, 3-second silo, 4-second silo; 5-first variable frequency screw conveyor, 6-second variable frequency screw conveyor, 7-third variable frequency screw conveyor, 8-first mother liquor ratio control regulating valve, 9-second mother liquor ratio control regulating valve, 10-third mother liquor ratio control regulating valve, 11-first liquid level gauge, 12-second liquid level gauge, 13-third liquid level gauge, 14-first agitator, 15-second agitator, 16-third agitator, 17-mother liquor flow meter, 18-second mother liquor flow meter, 19-third mother liquor flow meter, 20-first outlet control valve, 21-second outlet Inlet control valve, 22-third outlet control valve, 23-first preparation tank, 24-second preparation tank, 25-third preparation tank, 26-first heating coil, 27-second heating coil, 28-third heating coil, 29-first weighing instrument, 30-second weighing instrument, 31-third weighing instrument, 32-first online pH meter, 33-second online pH meter, 34-third online pH meter, 35-first online density meter, 36-second online density meter, 37-third online density meter, 38-heating medium control valve; 39-temperature control controller, 40-external heater, 41-43: electric gate valves. 41-first electric gate valve, 42-second electric gate valve, 43-third electric gate valve.

[0033] 101-mother liquor raw material conveying pipeline, 102-liquid storage conveying pipeline; 103-first solid raw material conveying branch line, 104-first liquid storage conveying branch line, 105-first liquid distribution conveying branch line, 106-liquid distribution conveying line, 107-second solid raw material conveying branch line, 108-second liquid storage conveying branch line, 109-second liquid distribution conveying branch line, 110-third solid raw material conveying branch line 110, 111-third liquid storage conveying branch line, 112-third liquid distribution conveying branch line, 113-solid raw material conveying line. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, the experiments were carried out according to conventional conditions or the conditions recommended by the reagent supplier. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0035] Example 1

[0036] As attached Figure 1 As shown, the present utility model discloses an automatic continuous alkali solution preparation system suitable for large-scale baking soda production, including a liquid storage device 1, and three preparation units (preparation unit A, preparation unit B, and preparation unit C) connected from the liquid storage device 1. The three preparation units are connected in parallel between the liquid storage device 1 and the downstream user device.

[0037] The liquid storage device 1 is connected with a mother liquor raw material conveying pipeline 101, and is connected with a liquid storage conveying pipeline 102;

[0038] The preparation unit A comprises a first bin 2, a first variable frequency screw conveyor 5 and a first preparation tank 23 connected in sequence; the first bin 2 is connected with a first solid raw material conveying branch line 103, the inlet of the first preparation tank 23 is connected with the liquid storage conveying pipeline 102 through a first liquid storage conveying branch line 104, the outlet of the first preparation tank 23 is connected with a first prepared liquid conveying branch line 105, and the first prepared liquid conveying branch line 105 is provided with a first outlet control valve 20;

[0039] The preparation unit B comprises a second bin 3, a second variable frequency screw conveyor 6 and a second preparation tank 24 connected in sequence; the second bin 3 is connected with a second solid raw material conveying branch line 107, the inlet of the second preparation tank 23 is connected with the liquid storage conveying pipeline 102 through a second liquid storage conveying branch line 108, the outlet of the second preparation tank 23 is connected with a second prepared liquid conveying branch line 109, and the second prepared liquid conveying branch line 109 is provided with a second outlet control valve 21;

[0040] The preparation unit C comprises a third bin 4, a third variable frequency screw conveyor 7 and a third preparation tank 25 connected in sequence; the third bin 4 is connected with a third solid raw material conveying branch line 110, the inlet of the third preparation tank 25 is connected with the liquid storage conveying pipeline 102 through a third liquid storage conveying branch line 111, the outlet of the third preparation tank 25 is connected with a third prepared liquid conveying branch line 112, and the third prepared liquid conveying branch line 112 is provided with a third outlet control valve 22,

[0041] The first prepared liquid conveying branch line 105, the second prepared liquid conveying branch line 109 and the third prepared liquid conveying branch line 112 are connected to a prepared liquid conveying line 106; the prepared liquid conveying line 106 is connected to a downstream user device; the first solid raw material conveying branch line 103, the second solid raw material conveying branch line 107 and the third solid raw material conveying branch line 110 are connected to a solid raw material conveying line 113.

[0042] Embodiment 2

[0043] As shown in the accompanying Figure 1 The utility model discloses an automatic continuous lye preparation system suitable for large -scale baking soda production, including liquid storage device 1, three preparation units (preparation unit A, preparation unit B, preparation unit C) from liquid storage device 1, and three preparation units are parallel between liquid storage device 1 and downstream user device.

[0044] The liquid storage device 1 is connected with a mother liquor raw material conveying pipeline 101, and is connected with a liquid storage conveying pipeline 102;

[0045] The preparation unit A comprises a first bin 2, a first variable frequency screw conveyor 5 and a first preparation tank 23 connected in sequence; the first bin 2 is connected with a first solid raw material conveying branch line 103, the inlet of the first preparation tank 23 is connected with the liquid storage conveying pipeline 102 through a first liquid storage conveying branch line 104, the outlet of the first preparation tank 23 is connected with a first prepared liquid conveying branch line 105, and the first prepared liquid conveying branch line 105 is provided with a first outlet control valve 20;

[0046] The preparation unit B comprises a second bin 3, a second variable frequency screw conveyor 6 and a second preparation tank 24 connected in sequence; the second bin 3 is connected with a second solid raw material conveying branch line 107, the inlet of the second preparation tank 23 is connected with the liquid storage conveying pipeline 102 through a second liquid storage conveying branch line 108, the outlet of the second preparation tank 23 is connected with a second prepared liquid conveying branch line 109, and the second prepared liquid conveying branch line 109 is provided with a second outlet control valve 21;

[0047] The preparation unit C comprises a third bin 4, a third variable frequency screw conveyor 7 and a third preparation tank 25 connected in sequence; the third bin 4 is connected with a third solid raw material conveying branch line 110, the inlet of the third preparation tank 25 is connected with the liquid storage conveying pipeline 102 through a third liquid storage conveying branch line 111, the outlet of the third preparation tank 25 is connected with a third prepared liquid conveying branch line 112, and the third prepared liquid conveying branch line 112 is provided with a third outlet control valve 22,

[0048] The first prepared liquid conveying branch line 105, the second prepared liquid conveying branch line 109 and the third prepared liquid conveying branch line 112 are connected to a prepared liquid conveying line 106; the prepared liquid conveying line 106 is connected to a downstream user device; the first solid raw material conveying branch line 103, the second solid raw material conveying branch line 107 and the third solid raw material conveying branch line 110 are connected to a solid raw material conveying line 113.

[0049] The first liquid storage conveying branch line 104 is provided with a first mother liquor flowmeter 17 and a first mother liquor proportional control valve 8 in sequence in the liquid flow direction; the second liquid storage conveying branch line 108 is provided with a second mother liquor flowmeter 18 and a second mother liquor proportional control valve 9 in sequence in the liquid flow direction; and the third liquid storage conveying branch line 111 is provided with a third mother liquor flowmeter 19 and a third mother liquor proportional control valve 10 in sequence in the liquid flow direction.

[0050] The first mother liquor proportional control valve 8 is signal connected with the first mother liquor flowmeter 17, the first screw conveyor 5; the second mother liquor proportional control valve 9 is signal connected with the second mother liquor flowmeter 18, the second screw conveyor 6; and the third mother liquor proportional control valve 10 is signal connected with the third mother liquor flowmeter 19, the third screw conveyor 7.

[0051] The mother liquor proportion control regulating valves 8, 9, 10 of each preparation unit are respectively connected with the mother liquor flow meters 17, 18, 19, the screw conveyers 5, 6, 7. The embodiment 2 gives a more preferred technical scheme on the basis of the embodiment 1. Specifically, the mother liquor proportion control regulating valves of each preparation unit are respectively connected with the mother liquor flow meters, the screw conveyers.

[0052] Embodiment 3

[0053] As shown in the accompanying drawings, Figure 1 The utility model discloses an automatic continuous lye preparation system suitable for large -scale baking soda production, including liquid storage device 1, three preparation units (preparation unit A, preparation unit B, preparation unit C) of liquid storage device 1 are drawn, three preparation units are parallel between liquid storage device 1 and downstream user device.

[0054] The liquid storage device 1 is connected with the mother liquor raw material conveying pipeline 101, and is connected with the liquid storage conveying pipeline 102.

[0055] Preparation unit A includes the first bin 2, the first variable frequency screw conveyer 5 and the first preparation tank 23 that are connected in proper order, the first bin 2 is connected with the first solid raw material conveying branch line 103, the inlet of the first preparation tank 23 is connected with the liquid storage conveying pipeline 102 through the first liquid storage conveying branch line 104, the outlet of the first preparation tank 23 is connected with the first liquid preparation conveying branch line 105, and the first liquid preparation conveying branch line 105 is provided with the first outlet control valve 20.

[0056] Preparation unit B includes the second bin 3, the second variable frequency screw conveyer 6 and the second preparation tank 24 that are connected in proper order, the second bin 3 is connected with the second solid raw material conveying branch line 107, the inlet of the second preparation tank 23 is connected with the liquid storage conveying pipeline 102 through the second liquid storage conveying branch line 108, the outlet of the second preparation tank 23 is connected with the second liquid preparation conveying branch line 109, and the second liquid preparation conveying branch line 109 is provided with the second outlet control valve 21.

[0057] Preparation unit C includes the third bin 4, the third variable frequency screw conveyer 7 and the third preparation tank 25 that are connected in proper order, the third bin 4 is connected with the third solid raw material conveying branch line 110, the inlet of the third preparation tank 25 is connected with the liquid storage conveying pipeline 102 through the third liquid storage conveying branch line 111, the outlet of the third preparation tank 25 is connected with the third liquid preparation conveying branch line 112, and the third liquid preparation conveying branch line 112 is provided with the third outlet control valve 22,

[0058] The first liquid preparation conveying branch 105, the second liquid preparation conveying branch 109 and the third liquid preparation conveying branch 112 are connected to the liquid preparation conveying line 106; the liquid preparation conveying line 106 is connected to a downstream user device; the first solid raw material conveying branch 103, the second solid raw material conveying branch 107 and the third solid raw material conveying branch 110 are connected to the solid raw material conveying line 113.

[0059] The first liquid storage conveying branch 104 is sequentially provided with a first mother liquor flow meter 17 and a first mother liquor proportional control valve 8 in the liquid flow direction; the second liquid storage conveying branch 108 is sequentially provided with a second mother liquor flow meter 18 and a second mother liquor proportional control valve 9 in the liquid flow direction; the third liquid storage conveying branch 111 is sequentially provided with a third mother liquor flow meter 19 and a third mother liquor proportional control valve 10 in the liquid flow direction.

[0060] The first mother liquor proportional control valve 8 is signal connected with the first mother liquor flow meter 17 and the first screw conveyor 5; the second mother liquor proportional control valve 9 is signal connected with the second mother liquor flow meter 18 and the second screw conveyor 6; the third mother liquor proportional control valve 10 is signal connected with the third mother liquor flow meter 19 and the third screw conveyor 7.

[0061] The first preparation tank 23 is provided with a first agitator 14 and a first heating coil 26; the second preparation tank 24 is provided with a second agitator 15 and a second heating coil 27; the third preparation tank 25 is provided with a third agitator 16 and a third heating coil 28.

[0062] The first preparation tank 23 is provided with a first liquid level meter 11 for detecting the liquid level of the first preparation tank 23, a first online pH meter 32 for detecting the pH value of the soda solution in the first preparation tank 23 and a first online density meter 35 for detecting the density of the soda solution, and the first liquid level meter 11 is signal connected with the first variable frequency screw conveyor 5 and the first mother liquor proportional control valve 8 respectively.

[0063] The second preparation tank 24 is provided with a second liquid level meter 12 for detecting the liquid level of the second preparation tank 24, a second online pH meter 33 for detecting the pH value of the soda solution in the second preparation tank 24 and a second online density meter 36 for detecting the density of the soda solution, and the second liquid level meter 12 is signal connected with the second variable frequency screw conveyor 6 and the second mother liquor proportional control valve 9 respectively.

[0064] The third preparation tank 25 is provided with a third liquid level meter 13 for detecting the liquid level of the third preparation tank 25, a third online pH meter 34 for detecting the pH value of the soda solution in the third preparation tank 25 and a third online density meter 37 for detecting the density of the soda solution, and the third liquid level meter 13 is signal connected with the third variable frequency screw conveyor 7 and the third mother liquor proportional control valve 10 respectively.

[0065] The embodiment 3 gives a more preferred technical scheme of the preparation tank based on the embodiment 2. Specifically, the preparation tank is provided with a stirrer, a heating coil, a liquid level meter, an online PH meter and an online density meter, and the liquid level meters of the respective preparation units are signal connected with the variable frequency screw conveyors of the units.

[0066] Embodiment 4

[0067] As shown in the accompanying drawings, Figure 1 The utility model discloses an automatic continuous lye preparation system suitable for large -scale baking soda production, including liquid storage device 1, three preparation units (preparation unit A, preparation unit B, preparation unit C) of liquid storage device 1 are drawn, three preparation units are parallelly connected between liquid storage device 1 and downstream user device.

[0068] Liquid storage device 1 is accessed with mother liquor raw material delivery pipeline 101, and is drawn with liquid storage delivery pipeline 102;

[0069] Preparation unit A includes the first bin 2 that is connected in proper order, first variable frequency screw conveyer 5 and first preparation tank 23, first bin 2 is accessed with first solid raw material delivery branch line 103, and the inlet of first preparation tank 23 is connected with liquid storage delivery pipeline 102 through first liquid storage delivery branch line 104, and the outlet of first preparation tank 23 is drawn with first liquid preparation delivery branch line 105, and first liquid preparation delivery branch line 105 is provided with first outlet control valve 20;

[0070] Preparation unit B includes the second bin 3 that is connected in proper order, second variable frequency screw conveyer 6 and second preparation tank 24, and second bin 3 is accessed with second solid raw material delivery branch line 107, and the inlet of second preparation tank 23 is connected with liquid storage delivery pipeline 102 through second liquid storage delivery branch line 108, and the outlet of second preparation tank 23 is drawn with second liquid preparation delivery branch line 109, and second liquid preparation delivery branch line 109 is provided with second outlet control valve 21;

[0071] Preparation unit C includes the third bin 4 that is connected in proper order, third variable frequency screw conveyer 7 and third preparation tank 25, and third bin 4 is accessed with third solid raw material delivery branch line 110, and the inlet of third preparation tank 25 is connected with liquid storage delivery pipeline 102 through third liquid storage delivery branch line 111, and the outlet of third preparation tank 25 is drawn with third liquid preparation delivery branch line 112, and third liquid preparation delivery branch line 112 is provided with third outlet control valve 22,

[0072] First liquid preparation delivery branch line 105, second liquid preparation delivery branch line 109 and third liquid preparation delivery branch line 112 are accessed to liquid preparation delivery line 106, and liquid preparation delivery line 106 is accessed to downstream user device, and first solid raw material delivery branch line 103, second solid raw material delivery branch line 107 and third solid raw material delivery branch line 110 are drawn by solid raw material delivery line 113.

[0073] The first liquid storage and delivery branch line 104 is provided with a first mother liquid flow meter 17 and a first mother liquid proportion control regulating valve 8 in sequence according to the direction of liquid flow; the second liquid storage and delivery branch line 108 is provided with a second mother liquid flow meter 18 and a second mother liquid proportion control regulating valve 9 in sequence according to the direction of liquid flow; the third liquid storage and delivery branch line 111 is provided with a third mother liquid flow meter 19 and a third mother liquid proportion control regulating valve 10 in sequence according to the direction of liquid flow.

[0074] The first mother liquor proportion control regulating valve 8 is connected to the first mother liquor flowmeter 17 and the first screw conveyor 5 by signal; the second mother liquor proportion control regulating valve 9 is connected to the second mother liquor flowmeter 18 and the second screw conveyor 6 by signal; the third mother liquor proportion control regulating valve 10 is connected to the third mother liquor flowmeter 19 and the third screw conveyor 7 by signal.

[0075] The first preparation tank 23 is provided with a first stirrer 14 and a first heating coil 26 ; the second preparation tank 24 is provided with a second stirrer 15 and a second heating coil 27 ; the third preparation tank 25 is provided with a third stirrer 16 and a third heating coil 28 .

[0076] The first preparation tank 23 is provided with a first liquid level meter 11 for detecting the liquid level thereof, a first online pH meter 32 for detecting the pH value of the soda ash solution in the first preparation tank 23, and a first online density meter 35 for detecting the density of the soda ash solution. The first liquid level meter 11 is respectively connected to the first variable frequency screw conveyor 5 and the first mother liquor ratio control regulating valve 8 for signal connection.

[0077] The second preparation tank 24 is provided with a second liquid level meter 12 for detecting the liquid level thereof, a second online pH meter 33 for detecting the pH value of the soda ash solution in the second preparation tank 24, and a second online density meter 36 for detecting the density of the soda ash solution. The second liquid level meter 12 is respectively connected to the second variable frequency screw conveyor 6 and the second mother liquor ratio control regulating valve 9 for signal connection.

[0078] The third preparation tank 25 is provided with a third liquid level gauge 13 for detecting the liquid level thereof, a third online pH meter 34 for detecting the pH value of the soda ash solution in the third preparation tank 25, and a third online density meter 37 for detecting the density of the soda ash solution. The third liquid level gauge 13 is respectively connected to the third variable frequency screw conveyor 7 and the third mother liquor ratio control regulating valve 10 for signal connection.

[0079] The first silo 2 is connected to a first weighing instrument 29 . A first gate valve 41 is provided on the first solid raw material conveying branch line 103 near the inlet of the first silo 2 . The first weighing instrument 29 is signal-connected to the first gate valve 41 .

[0080] The second silo 3 is connected to a second weighing instrument 30 . A second gate valve 42 is provided on the second solid raw material delivery branch line 107 near the inlet of the second silo 3 . The second weighing instrument 30 is signal-connected to the second gate valve 42 .

[0081] The third silo 4 is connected to a third weighing instrument 31 . A third gate valve 43 is provided on the third solid raw material delivery branch line 110 near the inlet of the third silo 4 . The third weighing instrument 31 is signal-connected to the third gate valve 43 .

[0082] This fourth embodiment, based on the work of Example 3, provides a more preferred technical solution for the silo. Specifically, a weighing scale is connected to the silo, and a gate valve is installed near the silo entrance on the solid raw material delivery branch line. The weighing scale of each preparation unit is connected to the gate valve of its own preparation unit. This arrangement allows the weighing scale and gate valve to automatically replenish the silo with solid soda ash for the next soda ash solution preparation.

[0083] Example 5

[0084] As attached Figure 1 As shown, the present utility model discloses an automatic continuous alkali solution preparation system suitable for large-scale baking soda production, including a liquid storage device 1, and three preparation units (preparation unit A, preparation unit B, and preparation unit C) connected from the liquid storage device 1. The three preparation units are connected in parallel between the liquid storage device 1 and the downstream user device.

[0085] The liquid storage device 1 is connected to a mother liquid raw material delivery pipeline 101 and is connected to a liquid storage delivery pipeline 102;

[0086] The preparation unit A includes a first silo 2, a first variable frequency screw conveyor 5, and a first preparation tank 23 connected in sequence; the first silo 2 is connected to a first solid raw material delivery branch line 103, the inlet of the first preparation tank 23 is connected to the liquid storage delivery pipeline 102 via a first liquid storage delivery branch line 104, and the outlet of the first preparation tank 23 is connected to a first liquid delivery branch line 105, and the first liquid delivery branch line 105 is provided with a first outlet control valve 20;

[0087] Preparation unit B includes a second silo 3, a second variable frequency screw conveyor 6, and a second preparation tank 24 connected in sequence; the second silo 3 is connected to a second solid raw material delivery branch line 107, the inlet of the second preparation tank 23 is connected to the liquid storage delivery pipeline 102 via a second liquid storage delivery branch line 108, and the outlet of the second preparation tank 23 is connected to a second liquid delivery branch line 109, and the second liquid delivery branch line 109 is provided with a second outlet control valve 21;

[0088] The preparation unit C comprises a third silo 4, a third variable frequency screw conveyor 7 and a third preparation tank 25 connected in sequence; the third silo 4 is connected with a third solid raw material conveying branch line 110, the inlet of the third preparation tank 25 is connected with the liquid storage conveying pipeline 102 through a third liquid storage conveying branch line 111, the outlet of the third preparation tank 25 is connected with a third prepared liquid conveying branch line 112, and the third prepared liquid conveying branch line 112 is provided with a third outlet control valve 22,

[0089] The first prepared liquid conveying branch line 105, the second prepared liquid conveying branch line 109 and the third prepared liquid conveying branch line 112 are connected to a prepared liquid conveying line 106; the prepared liquid conveying line 106 is connected to a downstream user device; the first solid raw material conveying branch line 103, the second solid raw material conveying branch line 107 and the third solid raw material conveying branch line 110 are connected to a solid raw material conveying line 113.

[0090] The first liquid storage conveying branch line 104 is provided with a first mother liquor flowmeter 17 and a first mother liquor proportional control valve 8 in sequence in the liquid flow direction; the second liquid storage conveying branch line 108 is provided with a second mother liquor flowmeter 18 and a second mother liquor proportional control valve 9 in sequence in the liquid flow direction; and the third liquid storage conveying branch line 111 is provided with a third mother liquor flowmeter 19 and a third mother liquor proportional control valve 10 in sequence in the liquid flow direction.

[0091] The first mother liquor proportional control valve 8 is signal connected with the first mother liquor flowmeter 17 and the first screw conveyor 5; the second mother liquor proportional control valve 9 is signal connected with the second mother liquor flowmeter 18 and the second screw conveyor 6; and the third mother liquor proportional control valve 10 is signal connected with the third mother liquor flowmeter 19 and the third screw conveyor 7.

[0092] The first preparation tank 23 is provided with a first agitator 14 and a first heating coil 26; the second preparation tank 24 is provided with a second agitator 15 and a second heating coil 27; and the third preparation tank 25 is provided with a third agitator 16 and a third heating coil 28.

[0093] The first preparation tank 23 is provided with a first liquid level meter 11 for detecting the liquid level thereof, a first online pH meter 32 for detecting the pH value of the soda solution in the first preparation tank 23 and a first online density meter 35 for detecting the density of the soda solution, and the first liquid level meter 11 is signal connected with the first variable frequency screw conveyor 5 and the first mother liquor proportional control valve 8 respectively.

[0094] The second preparation tank 24 is provided with a second liquid level meter 12 for detecting the liquid level thereof, a second online pH meter 33 for detecting the pH value of the soda solution in the second preparation tank 24 and a second online density meter 36 for detecting the density of the soda solution, and the second liquid level meter 12 is signal connected with the second variable frequency screw conveyor 6 and the second mother liquor proportional control valve 9 respectively.

[0095] The third preparation tank 25 is provided with a third liquid level meter 13 for detecting the liquid level thereof, and a third on-line pH meter 34 for detecting the pH value of the soda solution in the third preparation tank 25 and a third on-line density meter 37 for detecting the density of the soda solution, and the third liquid level meter 13 is signal connected with the third variable frequency screw conveyor 7 and the third mother liquor proportioning control valve 10 respectively.

[0096] The first bin 2 is connected with a first weighing instrument 29, and the first solid raw material conveying branch line 103 is provided with a first plug valve 41 near the inlet portion of the first bin 2, and the first weighing instrument 29 is signal connected with the first plug valve 41.

[0097] The second bin 3 is connected with a second weighing instrument 30, and the second solid raw material conveying branch line 107 is provided with a second plug valve 42 near the inlet portion of the second bin 3, and the second weighing instrument 30 is signal connected with the second plug valve 42.

[0098] The third bin 4 is connected with a third weighing instrument 31, and the third solid raw material conveying branch line 110 is provided with a third plug valve 43 near the inlet portion of the third bin 4, and the third weighing instrument 31 is signal connected with the third plug valve 43.

[0099] The liquid storage device 1 is provided with an external heater 40, the tube pass of the external heater 40 is connected with the liquid storage device 1 through a heating pipeline, the heating pipeline is provided with a temperature adjusting controller 39, the shell pass of the external heater 40 is connected with a heating medium conveying pipeline, the heating medium conveying pipeline is provided with a heating medium control valve 38, and the temperature adjusting controller 39 is connected with the heating medium control valve 38.

[0100] In the operation process of the utility model, the mother liquor outside is continuously sent to the liquid storage device 1 through the pipeline for temporary storage, the liquid storage device 1 is provided with an external heater 40 and a temperature adjusting controller 39, so that the temperature of the mother liquor sent to the preparation unit can be ensured to be within the range required by the process. The liquid in the liquid storage device 1 can be sent into one of the preparation units according to the requirement, the several preparation units are switched in the working state in turn, and the lye preparation is sequentially carried out, so that the continuous and stable production of the soda solution can be realized. The specific process is as follows: (taking the switching between the preparation units A, B and C as an example for description):

[0101] (1) preparation system initialization: the several preparation units have prepared the soda solution and are ready for use. One of the preparation units (taking the preparation unit A as an example) starts to deliver the prepared soda solution to the downstream, and the soda solution of the remaining preparation units is in the standby state.

[0102] (2) Switching the preparation unit: when the liquid level in the first preparation tank 23 drops to a certain value, the first outlet control valve 20 is automatically closed, and then the second outlet control valve 21 of the second preparation tank 24 of the preparation unit B is automatically opened according to the time setting, and the preparation unit B starts to transport the soda solution to the downstream.

[0103] (3) Preparing the soda solution: open the first mother liquor proportional control valve 8 of the preparation unit A to send the mother liquor in the liquid storage device 1 into the first preparation tank 23; when the first liquid level meter 11 detects that the liquid level of the first preparation tank 23 reaches the set value, the first variable frequency screw conveyor 5 is automatically opened to start quantitatively sending the soda solid powder from the first bin 2 to the first preparation tank 23. At the same time, the first mother liquor proportional control valve 8 adjusts the opening degree in real time according to the parameters of the first mother liquor flowmeter 17 and the first screw conveyor 5, so as to realize the proportional quantitative feeding of the mother liquor. During the preparation process, the speed of the first control agitator 14 and the amount of steam entering the first heating coil 26 are adjusted to make the composition of the soda solution uniform and ensure that its temperature is maintained within a suitable range. When the liquid level in the first preparation tank 23 reaches a certain value, the addition of the mother liquor and the soda solid is automatically stopped. The prepared soda solution is stored in the first preparation tank 23 for use.

[0104] (4) Detection of the soda solution: during the preparation process, the first online density analyzer 35 and the first online pH meter 32 are used to continuously detect the properties of the soda solution online, and the total alkalinity is calculated. If the alkalinity is lower than required, the required soda solid is calculated and added; if the alkalinity is higher than required, the required mother liquor is calculated and added. The properties of the finally prepared soda solution meet the requirements.

[0105] 5 Restoration of the preparation unit: under the operation of the first weighing instrument 29 and the first plug valve 41, the first bin 2 is supplemented with soda solid for the next soda solution preparation.

[0106] When the liquid level in the second preparation tank 24 of the preparation unit B drops to a certain value, the third outlet control valve 22 of the third preparation tank 25 of the preparation unit C is opened, and the preparation unit C starts to transport the soda solution to the downstream. The preparation of the soda solution in the second preparation tank 24 is started, and the switching of the preparation unit B and the preparation unit C is performed. When the liquid level in the third preparation tank 25 drops to a certain value, the outlet control valve 20 of the first preparation tank 23 is opened, and the preparation unit A starts to transport the soda solution to the downstream. The preparation of the soda solution in the third preparation tank 25 is started, and the switching of the preparation unit C and the preparation unit A is completed.

[0107] The above merely describes preferred embodiments of the utility model, and does not limit the utility model in any form, and according to the technical essence of the utility model, any simple modification, equivalent replacement and improvement of the above embodiments within the spirit and principle of the utility model still belong to the protection scope of the utility model technical scheme.

Claims

1. An automatic continuous lye preparation system suitable for large-scale baking soda production, characterized in that, The system comprises a liquid storage device, a plurality of preparation units connected to the liquid storage device, and each preparation unit is connected in parallel between the liquid storage device and a downstream user device; Each preparation unit comprises a bin, a variable frequency screw conveyor and a preparation tank connected in sequence; The liquid storage device is connected to a mother liquor raw material conveying pipeline and is connected to a liquid storage conveying pipeline; The bin of each preparation unit is connected to a solid raw material conveying branch line, the inlet of the preparation tank of each preparation unit is connected to the liquid storage conveying pipeline through a liquid storage conveying branch line, the outlet of the preparation tank of each preparation unit is connected to a liquid preparation conveying branch line, an outlet control valve for controlling the output of the caustic soda solution is arranged on each liquid preparation conveying branch line, and each liquid preparation conveying branch line is connected to the downstream user device.

2. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, A mother liquor flow meter and a mother liquor proportional control valve are arranged in sequence on the liquid storage conveying branch line of each preparation unit in the liquid flow direction, and the mother liquor proportional control valve is connected to the mother liquor flow meter and the variable frequency screw conveyor.

3. The automatic continuous alkali solution preparation system suitable for large-scale sodium bicarbonate production according to claim 2, characterized in that: Each preparation tank of each preparation unit is connected to a liquid level meter for detecting the liquid level of the preparation tank, and the liquid level meter is connected to the variable frequency screw conveyor and the mother liquor proportional control valve.

4. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, Each preparation tank of each preparation unit is connected to an online pH meter for detecting the pH value of the caustic soda solution prepared in the preparation tank and an online density meter for detecting the density of the caustic soda solution.

5. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, Each preparation tank of each preparation unit is provided with a stirrer.

6. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, Each preparation tank of each preparation unit is provided with a heating coil.

7. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, Each bin of each preparation unit is connected to a weighing instrument, and each solid raw material conveying branch line of each preparation unit is provided with a gate valve near the inlet of the bin, and the weighing instrument of each preparation unit is connected to the gate valve.

8. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, The liquid storage device is provided with an external heater, the tube side of the external heater is connected to the liquid storage device through a heating pipeline, a temperature adjusting controller is arranged on the heating pipeline, the shell side of the external heater is connected to a heating medium conveying pipeline, a heating medium control valve is arranged on the heating medium conveying pipeline, and the temperature adjusting controller is connected to the heating medium control valve.

9. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, The number of preparation units is greater than or equal to 2, and each preparation unit is connected in parallel between the liquid storage device and the downstream user device.

10. The automatic continuous lye preparation system suitable for large-scale small soda production according to claim 1, characterized in that, The system further comprises a liquid preparation conveying line, and each liquid preparation conveying branch line is connected to the downstream user device through the liquid preparation conveying line.

Images