A device for on-line determination and control of sub-sodium concentration

Abstract

The utility model discloses a kind of secondary sodium concentration on-line determination and control device, specifically related to chemical technology field, including device main body, device main body includes base, the bottom of base is fixedly connected with gear box, the top of base is provided with measuring mechanism, for determining the concentration of sodium hypochlorite, measuring mechanism includes semi-finished product groove, the surface of semi-finished product groove is fixedly connected with lye concentration on-line analyzer, one end of lye concentration on-line analyzer is fixedly connected with configuration mechanism, for configuring lye, the inside of gear box is provided with stirring mechanism, for the stirring of configuration mechanism. The utility model determines the effective chlorine and free alkali of substance after reactor reaction by on-line analyzer, solve the problem that manual sampling measurement needs multiple times when measuring sodium hypochlorite.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to an online sodium hypochlorite concentration measurement and control device. Background Technology

[0002] In the production process of sodium hypochlorite, chlorine gas and alkaline solution are absorbed in a sodium hypochlorite reactor (falling film absorption) to produce sodium hypochlorite. The sodium hypochlorite then flows by gravity from the bottom of the reactor into an intermediate tank, and is subsequently transported to the finished product tank for sale. During the production process, sodium hypochlorite products must be tested to ensure that the available chlorine content is >13.5% and the free alkali content is 0.3-0.8% to be considered a qualified product for sale.

[0003] A search revealed, for example, a Chinese patent application with publication number CN214142556U, which discloses a distribution system for producing sodium hypochlorite. The system includes a clear water tank inlet connected to a pipe supplying clear water; the clear water tank connected to a salt dissolving tank via a pipe equipped with a makeup water pump; the salt outlet of the salt dissolving tank connected to a metering pump via a pipe; the clear water tank outlet connected to a clear water pump via a pipe; the outlets of the clear water pump and the metering pump merge via a pipe equipped with a valve and are then connected to the inlet of an electrolytic cell; the inlet of the electrolytic cell is connected to an unused sampling valve A at its outlet; and the outlet of the electrolytic cell is connected to a storage tank via a pipe equipped with a valve, with an unused sampling valve B at its outlet also connected to the pipe.

[0004] However, in actual use, staff take samples of the sodium hypochlorite liquid produced by the reaction from sampling valve B for testing. However, the existing method for determining sodium hypochlorite is to manually sample and test it. First, sampling and analysis takes time and wastes manpower and resources. Second, the analysis results cannot be used for current production. Adjustments based on manual analysis results are already lagging behind, which will cause instability in the sodium hypochlorite production process and product quality. Utility Model Content

[0005] The purpose of this invention is to provide an online sodium hypochlorite concentration measurement and control device. This device uses an online analyzer to measure the available chlorine and free alkali in the reactants after the reactor reaction, thus solving the problem of requiring multiple manual sampling measurements when measuring sodium hypochlorite.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an online sodium hypochlorite concentration measurement and control device, comprising a device body, the device body including a base, and a gearbox fixedly connected to the bottom of the base;

[0007] The base is equipped with a measuring mechanism on its top for measuring the concentration of sodium hypochlorite.

[0008] The measuring mechanism includes a semi-finished product tank, on the surface of which an online alkaline solution concentration analyzer is fixedly connected. One end of the online alkaline solution concentration analyzer is fixedly connected to a configuration mechanism for configuring the alkaline solution.

[0009] The gearbox is equipped with a stirring mechanism for stirring the configuration mechanism.

[0010] Preferably, the measuring mechanism further includes an electrolysis tank, a chlorine gas delivery pump is fixedly connected to the top of the electrolysis tank, the input end of the chlorine gas delivery pump is connected to the flange of the electrolysis tank, a reactor is arranged on the outside of the electrolysis tank, and a chlorine inlet pipe, a water inlet pipe and a water outlet pipe are arranged sequentially from high to low on the surface of the reactor, and a first regulating valve is connected to the flange of the output end of the chlorine gas delivery pump, and the output end of the first regulating valve is connected to the flange of the chlorine inlet pipe.

[0011] Preferably, a tee is fixedly sleeved at the bottom of the reactor, an online analyzer is connected to one flange of the tee, a third regulating valve is connected to one flange of the online analyzer, a finished product tank is connected to one flange of the third regulating valve, and a finished product conveying pump located at the top of the base is fixedly connected to the outside of the finished product tank, with the input end of the finished product conveying pump connected to the flange of the finished product tank.

[0012] Preferably, the other end flange of the tee is connected to a second regulating valve, one end of the second regulating valve is connected to the flange of the semi-finished product tank, and an alkali pump located on the top of the base is fixedly connected to the outside of the semi-finished product tank. The input end of the alkali pump is connected to the flange of the semi-finished product tank, and the output end of the alkali pump is connected to the flange of the reactor.

[0013] Preferably, both the semi-finished product tank and the finished product tank are equipped with level gauges.

[0014] Preferably, the configuration mechanism includes a configuration tank, storage tanks are symmetrically arranged on the outer side of the configuration tank, a feed inlet is provided on the top of the storage tank, an input pump is fixedly connected to the center of the top of the storage tank, the input end of the input pump is connected to the flange of the storage tank, the output end of the input pump is connected to the flange of the configuration tank, and an alkali outlet pipe is provided on the outer wall of the configuration tank.

[0015] Preferably, the stirring mechanism includes two stirring rods, with synchronous pulleys fixedly sleeved on the surface of each stirring rod. The two synchronous pulleys are connected by a belt drive. Multiple stirring blades are fixedly connected to the surface of each stirring rod. A servo motor is fixedly connected inside one of the gearboxes, and the output end of the servo motor is fixedly connected to one of the stirring rods.

[0016] Preferably, a sealing body is provided on the surface of the connection point between the chlorine gas delivery pump and the first regulating valve, and gas outlet pipes are symmetrically arranged on the outer wall of the sealing body, with a pressure gauge installed inside one of the gas outlet pipes.

[0017] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0018] 1. This utility model discloses an online sodium hypochlorite concentration determination and control device. It measures the available chlorine and free alkali of the substances after the reactor reaction using an online analyzer, reducing the frequency of manual sampling and analysis and minimizing harm to personnel. Furthermore, based on the measured available chlorine and free alkali values, it controls the amount of chlorine added by adjusting the chlorine gas output flow rate of the chlorine delivery pump and appropriately opening or closing the first regulating valve. It also controls the amount of alkali added by adjusting the alkali output flow rate of the alkali pump. Thus, it controls the product concentration in real time based on the values ​​displayed by the online analyzer, reducing manual operation and improving product quality stability.

[0019] 2. This utility model provides an online sodium hypochlorite concentration measurement and control device. By using an online alkali concentration analyzer, the concentration of the alkali solution in the preparation tank can be analyzed. When the concentration value is incorrect, the operator can start two different input pumps according to their experience to increase or decrease the concentration of the alkali solution in the preparation tank, so that the concentration of the alkali solution input into the semi-finished product tank is always maintained within a certain range, thereby ensuring the quality of the product. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the measuring mechanism structure of this utility model;

[0023] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0024] Figure 4 This is a schematic diagram of the configuration mechanism of this utility model;

[0025] Figure 5 This is a schematic diagram of the stirring mechanism of this utility model;

[0026] Figure 6 This is a schematic diagram of the main structure of the device of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Main body of the device; 11. Base; 12. Gearbox; 2. Measuring mechanism; 21. Electrolysis tank; 22. Chlorine gas transfer pump; 23. First regulating valve; 24. Chlorine inlet pipe; 25. Water inlet pipe; 26. Water outlet pipe; 27. Reactor; 28. T-junction; 29. ​​Second regulating valve; 210. Semi-finished product tank; 211. Alkali pump; 212. Level gauge; 213. Online alkali concentration analyzer; 214. Finished product tank; 215. Finished product transfer pump; 216. Third regulating valve; 217. Online analyzer; 3. Configuration mechanism; 31. Configuration tank; 32. Storage tank; 33. Feed inlet; 34. Input pump; 35. Alkali outlet pipe; 4. Stirring mechanism; 41. Synchronous pulley; 42. Stirring rod; 43. Stirring blade; 44. Servo motor; 45. Belt; 5. Sealing body; 6. Pressure gauge; 7. Gas outlet pipe. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] This utility model provides, for example Figure 1-6 The device shown is an online sodium hypochlorite concentration measurement and control device, including a main body 1. The main body 1 includes a base 11, and a gearbox 12 is fixedly connected to the bottom of the base 11. A measuring mechanism 2 is provided on the top of the base 11 for measuring the concentration of sodium hypochlorite. The measuring mechanism 2 includes a semi-finished product tank 210, the bottom of which is fixedly connected to the top of the base 11. An online alkaline solution concentration analyzer 213 is fixedly connected to the surface of the semi-finished product tank 210. A configuration mechanism 3 is fixedly connected to one end of the online alkaline solution concentration analyzer 213 for configuring alkaline solution. A stirring mechanism 4 is provided inside the gearbox 12 for stirring the configuration mechanism 3.

[0031] In order to introduce chlorine gas into reactor 27, such as Figure 2 As shown, the measuring mechanism 2 also includes an electrolysis tank 21. The bottom of the electrolysis tank 21 is fixedly connected to the top of the base 11. A chlorine gas delivery pump 22 is fixedly connected to the top of the electrolysis tank 21. The input end of the chlorine gas delivery pump 22 is connected to the flange of the electrolysis tank 21. A reactor 27 is arranged on the outside of the electrolysis tank 21. A chlorine inlet pipe 24, a water inlet pipe 25, and a water outlet pipe 26 are arranged sequentially from high to low on the surface of the reactor 27. The water inlet pipe 25 and the water outlet pipe 26 are connected to a cooling mechanism for heat dissipation inside the reactor 27. The cooling mechanism is a plate cooler. A first regulating valve 23 is connected to the flange of the output end of the chlorine gas delivery pump 22. The output end of the first regulating valve 23 is connected to the flange of the chlorine inlet pipe 24.

[0032] In the production of sodium hypochlorite, chlorine gas needs to be continuously introduced into reactor 27. First, chlorine gas is generated inside the electrolysis tank 21. The preparation of chlorine gas adopts the electrolysis method, which is a mature existing technology. The specific internal structure and working principle will not be described in detail here. The generated chlorine gas is extracted by chlorine gas delivery pump 22, and after passing through the first regulating valve 23, it enters the reactor 27 through the chlorine inlet pipe 24.

[0033] To facilitate the measurement of sodium hypochlorite concentration after the reaction, a tee 28 is fixedly connected to the bottom of reactor 27. One end flange of tee 28 is connected to an online analyzer 217, which can measure available chlorine and free alkali in the substance. One end flange of online analyzer 217 is connected to a third regulating valve 216, and one end flange of third regulating valve 216 is connected to a finished product tank 214. The bottom of finished product tank 214 is fixedly connected to the top of base 11. A finished product delivery pump 215 located on the top of base 11 is fixedly connected to the outside of finished product tank 214. The input end of finished product delivery pump 215 is connected to the flange of finished product tank 214. The other end flange of tee 28 is connected to a second regulating valve 29. One end of second regulating valve 29 is connected to the flange of semi-finished product tank 210. An alkali pump 211 located on the top of base 11 is fixedly connected to the outside of semi-finished product tank 210. The input end of alkali pump 211 is connected to the flange of semi-finished product tank 210, and the output end of alkali pump 211 is connected to the flange of reactor 27.

[0034] When the effective chlorine value measured by the online analyzer 217 is too low, the operator first controls the chlorine delivery pump 22 to increase the chlorine flow rate input to the reactor 27, and then rotates the first regulating valve 23 to adjust the chlorine flow rate. If the free alkali value is too low, the operator controls the alkali pump 211 to increase the flow rate input from the semi-finished product tank 210 into the reactor 27.

[0035] After the above operations are completed, the staff closes the third regulating valve 216 and then opens the second regulating valve 29 to allow the semi-finished product to flow into the semi-finished product tank 210. After the above operations have been performed for a period of time, the data of the online analyzer 217 is normal. The staff then opens the third regulating valve 216 and closes the second regulating valve 29 to allow the finished product to flow into the finished product tank 214. The finished product inside the finished product tank 214 is then fed into the finished product container for storage via the finished product conveying pump 215.

[0036] It should be noted that both the chlorine gas transfer pump 22 and the alkali solution pump 211 are variable frequency pumps.

[0037] To measure the volumes of the semi-finished product tank 210 and the finished product tank 214, such as Figure 2 As shown, both the semi-finished product tank 210 and the finished product tank 214 are equipped with level gauges 212.

[0038] To ensure that the input alkaline solution always maintains a certain concentration, such as Figure 3 As shown, the configuration mechanism 3 includes a configuration tank 31, and storage tanks 32 are symmetrically arranged on the outer side of the configuration tank 31. The bottoms of the configuration tank 31 and the storage tank 32 are both fixedly connected to the top of the base 11. The top of the storage tank 32 is provided with a feed inlet 33. An input pump 34 is fixedly connected to the center of the top of the storage tank 32. The input end of the input pump 34 is connected to the flange of the storage tank 32. The output end of the input pump 34 is connected to the flange of the configuration tank 31. An alkali outlet pipe 35 is provided on the outer wall of the configuration tank 31.

[0039] It should be noted that valves are provided on the surfaces of the two pipes used to connect to the input pump 34 and the configuration tank 31. When it is necessary to input alkali into the reactor 27 through the alkali pump 211, the valves need to be closed, and vice versa, so as to make the concentration of the input alkali more stable.

[0040] When alkali solution is delivered through alkali solution pump 211, alkali solution concentration online analyzer 213 will measure the alkali solution concentration. When the alkali solution concentration is too low, the operator will turn off alkali solution pump 211 and then open the valve. The operator will open different input pumps 34 according to their experience to make the alkali solution concentration inside the preparation tank 31 normal.

[0041] It should be noted that the two storage tanks 32 store high-concentration alkali solution and water respectively, both of which are poured into the storage tanks 32 from the feed inlet 33. When the alkali solution concentration is too high, the input pump 34 at the top of the water storage tank 32 is turned on, and vice versa. When the alkali solution concentration in the preparation tank 31 is normal, the operator closes the valve and turns on the alkali solution pump 211 again, so that the alkali solution and semi-finished product are transported into the reactor 27.

[0042] It should also be noted that, for better configuration, input pump 34 is also a variable frequency pump.

[0043] To ensure the alkaline solution is uniform inside the preparation tank 31 and the semi-finished product tank 210, such as... Figure 5As shown, the stirring mechanism 4 includes two stirring rods 42, which are rotatably connected to the inside of the gearbox 12 via bearings. Synchronous pulleys 41 are fixedly sleeved on the surface of the stirring rods 42, and the two synchronous pulleys 41 are connected by a belt 45. Multiple stirring blades 43 are fixedly connected to the surface of the stirring rods 42. The two stirring rods 42 are respectively inserted into the preparation tank 31 and the semi-finished product tank 210. A servo motor 44 is fixedly connected inside one of the gearboxes 12, and the output end of the servo motor 44 is fixedly connected to one of the stirring rods 42. When preparing the alkali solution in the preparation tank 31, the operator starts the servo motor 44. The start of the servo motor 44 drives the connected stirring rod 42 to rotate. The rotation of the stirring rod 42 drives the synchronous pulley 41 on its surface to rotate. The rotation of the synchronous pulley 41 drives the other synchronous pulley 41 to rotate via the belt 45, thereby driving the other stirring rod 42 to rotate. Thus, the servo motor 44 simultaneously starts both stirring rods 42, and they stir the preparation tank 31 and the semi-finished product tank 210 respectively, making the alkali solution more uniform.

[0044] To prevent chlorine gas leaks from affecting the health of workers during chlorine gas transportation, such as... Figure 3 As shown, a sealing body 5 is provided on the surface of the connection point between the chlorine gas delivery pump 22 and the first regulating valve 23. A gas outlet pipe 7 is symmetrically arranged on the outer wall of the sealing body 5. A pressure gauge 6 is installed inside one of the gas outlet pipes 7. When a chlorine gas leak is detected at the connection point, the chlorine gas will enter the sealing body 5 and be stored inside the sealing body 5. This will increase the value displayed on the pressure gauge 6. The staff can know that a leak has occurred from the pressure gauge 6. After the staff finds out the problem, they can insert a vacuum pump through the other gas outlet pipe 7 port to extract the chlorine gas located inside the sealing body 5.

[0045] It should be noted that the other vent pipe 7 is equipped with a structure for extracting internal gas, which is a mature existing technology. Its specific internal structure and working principle will not be described in detail here.

[0046] Finally, it should be noted that the above structure is located on the surface of all connection points and is used to measure whether leakage occurs at the connection points. In order to better connect the pipe, one end of the sealing body 5 is provided with a circular hole that matches the diameter of the pipe. The pipe is inserted into the sealing body 5 through the circular hole and connected to the equipment. The sealing body 5 is fixedly connected to the surface of the equipment pipe. At the same time, in order to prevent leakage, a rubber sealing sleeve is glued to the surface of the circular hole to seal the gap between the pipe and the sealing body 5.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents. The terms "comprising" or "including" as used in this invention mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. The technical or scientific terms used in this invention should be understood in their ordinary sense by those skilled in the art.

Claims

1. An online sodium hypochlorite concentration measurement and control device, comprising a main body (1), characterized in that: The main body (1) of the device includes a base (11), and a gearbox (12) is fixedly connected to the bottom of the base (11); The base (11) is provided with a measuring mechanism (2) on top for measuring the concentration of sodium hypochlorite; The measuring mechanism (2) includes a semi-finished product tank (210), on the surface of the semi-finished product tank (210) is fixedly connected an online alkaline concentration analyzer (213), and one end of the online alkaline concentration analyzer (213) is fixedly connected to a configuration mechanism (3) for configuring the alkaline solution; The gearbox (12) is equipped with a stirring mechanism (4) for stirring the configuration mechanism (3).

2. The online sodium hypochlorite concentration measurement and control device according to claim 1, characterized in that: The measuring mechanism (2) also includes an electrolysis tank (21), a chlorine gas delivery pump (22) is fixedly connected to the top of the electrolysis tank (21), the input end of the chlorine gas delivery pump (22) is connected to the flange of the electrolysis tank (21), a reactor (27) is provided on the outside of the electrolysis tank (21), and a chlorine inlet pipe (24), a water inlet pipe (25) and a water outlet pipe (26) are arranged sequentially from high to low on the surface of the reactor (27), and a first regulating valve (23) is connected to the flange of the output end of the chlorine gas delivery pump (22), and the output end of the first regulating valve (23) is connected to the flange of the chlorine inlet pipe (24).

3. The online sodium hypochlorite concentration measurement and control device according to claim 2, characterized in that: A tee (28) is fixedly sleeved at the bottom of the reactor (27). One end flange of the tee (28) is connected to an online analyzer (217). One end flange of the online analyzer (217) is connected to a third regulating valve (216). One end flange of the third regulating valve (216) is connected to a finished product tank (214). A finished product conveying pump (215) located on the top of the base (11) is fixedly connected to the outside of the finished product tank (214). The input end of the finished product conveying pump (215) is connected to the flange of the finished product tank (214).

4. The online sodium hypochlorite concentration measurement and control device according to claim 3, characterized in that: The other end of the tee (28) is connected to a second regulating valve (29). One end of the second regulating valve (29) is connected to the flange of the semi-finished product tank (210). An alkaline pump (211) located on the top of the base (11) is fixedly connected to the outside of the semi-finished product tank (210). The input end of the alkaline pump (211) is connected to the flange of the semi-finished product tank (210), and the output end of the alkaline pump (211) is connected to the flange of the reactor (27).

5. The online sodium hypochlorite concentration measurement and control device according to claim 4, characterized in that: The semi-finished product tank (210) and the finished product tank (214) are both equipped with level gauges (212).

6. The online sodium hypochlorite concentration measurement and control device according to claim 1, characterized in that: The configuration mechanism (3) includes a configuration tank (31), and storage tanks (32) are symmetrically arranged on the outside of the configuration tank (31). A feed inlet (33) is provided on the top of the storage tank (32). An input pump (34) is fixedly connected to the center of the top of the storage tank (32). The input end of the input pump (34) is connected to the flange of the storage tank (32), and the output end of the input pump (34) is connected to the flange of the configuration tank (31). An alkali outlet pipe (35) is provided on the outer wall of the configuration tank (31).

7. The online sodium hypochlorite concentration measurement and control device according to claim 1, characterized in that: The stirring mechanism (4) includes two stirring rods (42), and a synchronous wheel (41) is fixedly sleeved on the surface of the stirring rod (42). The two synchronous wheels (41) are connected by a belt (45). Multiple stirring blades (43) are fixedly connected to the surface of the stirring rod (42). A servo motor (44) is fixedly connected inside one of the gearboxes (12). The output end of the servo motor (44) is fixedly connected to one of the stirring rods (42).

8. The online sodium hypochlorite concentration measurement and control device according to claim 2, characterized in that: A sealing body (5) is provided on the surface of the connection point between the chlorine gas delivery pump (22) and the first regulating valve (23). A gas outlet pipe (7) is symmetrically arranged on the outer wall of the sealing body (5), and a pressure gauge (6) is provided inside one of the gas outlet pipes (7).

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