A device for automatically switching determination of a subsodium product

Abstract

The utility model relates to the technical field of chemical production, provide a kind of secondary sodium product automatic switching determination device, solve the problem of unstable product quality due to design defects of existing production device.The utility model includes: at least two reactors;Semi-finished product tank for receiving unqualified products from reactor;Finished product tank for receiving qualified products from reactor;First conveying pipe for introducing unqualified products in each reactor into the semi-finished product tank;Second conveying pipe for introducing qualified products in each reactor into the finished product tank, each second conveying pipe is equipped with regulating valve;Branch pipe, both ends are respectively communicated with each second conveying pipe, the branch pipe is equipped with on-line analyzer, and the on-line analyzer both sides are equipped with cut-off valve;Through sodium hypochlorite on-line determination of available chlorine and free alkali, reduce the frequency of manual sampling and analysis, while reducing the harm to personnel.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to a device for automatic switching and measurement of sodium hypochlorite products. Background Technology

[0002] In the sodium hypochlorite production process, chlorine gas and alkaline solution are absorbed in the sodium hypochlorite reactor (falling film absorption) to produce sodium hypochlorite. During production, the sodium hypochlorite product must have an available chlorine content >13.5% and a free alkali content of 0.3-0.8% to be considered a qualified product for sale. Previously, these two indicators were measured manually. This method is time-consuming and wastes manpower and resources. Furthermore, the analysis results are not relevant to real-time production, and adjustments based on manual analysis are lagging, leading to instability in the sodium hypochlorite production process and product quality. Utility Model Content

[0003] Therefore, in order to address the above problems, this utility model provides an automatic switching and measurement device for sodium hypochlorite products, which solves the problem of unstable product quality caused by design defects in existing production equipment.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] An apparatus for automatically switching and measuring sodium hypochlorite products, comprising:

[0006] At least two reactors;

[0007] Semi-finished product tank, used to receive defective products from the reactor;

[0008] Finished product tank, used to receive qualified products from the reactor;

[0009] The first conveying pipe is used to introduce the defective products in each of the reactors into the semi-finished product tank;

[0010] The second conveying pipe is used to introduce the qualified products in each of the reactors into the finished product tank, and each of the second conveying pipes is equipped with a regulating valve.

[0011] A branch pipe is connected to each of the second delivery pipes at both ends. An online analyzer is installed on the branch pipe, and a shut-off valve is installed on both sides of the online analyzer.

[0012] The controller is connected to the online analyzer, each of the regulating valves, and each of the shut-off valves. The controller is configured to switch the opening and closing of each shut-off valve at set time intervals t to ensure that only one reactor's product is introduced into the online analyzer at any given time. Based on the concentration data measured in real time by the online analyzer, the controller determines whether the quality of the product from the corresponding reactor is qualified. If the product is qualified, the controller opens the regulating valve on the second delivery pipe corresponding to that reactor. If the product is unqualified, the controller closes or shuts the regulating valve.

[0013] Furthermore, it also includes a circulation pump located at the outlet of the semi-finished product tank, the outlet of the circulation pump being connected to the feed inlet of each of the reactors, and the controller being connected to the circulation pump. The controller is further configured to: when the product is unqualified, start or increase the flow rate of the circulation pump to send the unqualified product back to the reactor for re-reaction.

[0014] Furthermore, the circulating pump is a variable frequency pump.

[0015] Furthermore, the set time t is 0.5h-3h.

[0016] Furthermore, the reactor, semi-finished product tank, finished product tank, first conveying pipe, second conveying pipe, and branch pipe are all made of corrosion-resistant materials, namely polytetrafluoroethylene, polyvinylidene fluoride, or Hastelloy.

[0017] Furthermore, the reactor is a sodium hypochlorite reactor.

[0018] Furthermore, the online analyzer includes an online available chlorine analyzer and an online alkalinity analyzer.

[0019] Furthermore, both the semi-finished product tank and the finished product tank are equipped with level gauges, which are signal-connected to the controller.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model uses sodium hypochlorite to determine available chlorine and free alkali online, reducing the frequency of manual sampling and analysis, and at the same time reducing harm to personnel.

[0022] 2. The measured effective chlorine and free alkali values ​​are used as feedback for production control to control the amount of chlorine and alkali added, thereby achieving real-time control of product concentration based on online values ​​and improving product quality stability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0024] Explanation of icon numbers:

[0025] Reactor 1;

[0026] Semi-finished product tank 2;

[0027] Finished product tank 3;

[0028] First delivery pipe 4;

[0029] Second delivery pipe 5; regulating valve 51;

[0030] Branch pipe 6; online analyzer 61; shut-off valve 62. Detailed Implementation

[0031] The following will describe the implementation of this utility model in detail with reference to specific embodiments, so that the process of how this utility model uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0032] Example: Figure 1 As shown, an automatic switching and measuring device for sodium hypochlorite products includes:

[0033] Two reactors 1, wherein reactor 1 is a sodium hypochlorite reactor;

[0034] Semi-finished product tank 2 is used to receive non-conforming products from reactor 1;

[0035] Finished product tank 3 is used to receive qualified products from reactor 1;

[0036] The first conveying pipe 4 is used to introduce the defective products in each of the reactors 1 into the semi-finished product tank 2;

[0037] The second conveying pipe 5 is used to introduce the qualified products in each of the reactors 1 into the finished product tank 3. Each of the second conveying pipes 5 is equipped with a regulating valve 51.

[0038] Branch pipe 6 is connected to each of the second delivery pipes 5 at both ends. An online analyzer 61 is provided on the branch pipe 6. Shut-off valves 62 are provided on both sides of the online analyzer 61. The online analyzer 61 includes an online available chlorine analyzer and an online alkalinity analyzer.

[0039] A controller (not shown in the figure) is connected to the online analyzer 61, each of the regulating valves 51, and each of the shut-off valves 62. The controller is configured to switch the opening and closing of each shut-off valve 62 at set intervals of 1 hour to ensure that only one product from reactor 1 is introduced into the online analyzer 61 at any given time. Based on the concentration data measured in real time by the online analyzer 61, the controller determines whether the quality of the product from reactor 1 is qualified. If the product is qualified, the controller controls the regulating valve 51 on the second delivery pipe 5 corresponding to reactor 1 to open. If the product is unqualified, the controller controls the regulating valve 51 to close or shut it off based on the concentration data measured in real time. The controller is a programmable logic controller.

[0040] By using sodium hypochlorite to measure available chlorine and free alkali online, the frequency of manual sampling and analysis is reduced, thus minimizing harm to personnel. The measured available chlorine and free alkali values ​​are used as feedback for production control to regulate the amount of chlorine and alkali added, thereby achieving real-time control of product concentration based on online values ​​and improving product quality stability.

[0041] It also includes a circulation pump 31 located at the outlet of the semi-finished product tank 2. The outlet of the circulation pump 31 is connected to the feed inlet of each of the reactors 1. The controller is connected to the circulation pump 31. The controller is further configured to increase the flow rate of the circulation pump 31 when the product is unqualified, and send the unqualified product back to the reactor 1 for re-reaction. The circulation pump 31 is a variable frequency pump.

[0042] The reactor 1, semi-finished product tank 2, finished product tank 3, first conveying pipe 4, second conveying pipe 5, and branch pipe 6 are all made of corrosion-resistant material, namely polytetrafluoroethylene.

[0043] Both the semi-finished product tank 2 and the finished product tank 3 are equipped with level gauges (not shown in the figure). The level gauges are connected to the controller. When the level value of the level gauge exceeds the set value, the circulation pump 31 is started.

[0044] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A device for automatically switching and measuring sodium hypochlorite products, characterized in that, include: At least two reactors; Semi-finished product tank, used to receive defective products from the reactor; Finished product tank, used to receive qualified products from the reactor; The first conveying pipe is used to introduce the defective products in each of the reactors into the semi-finished product tank; The second conveying pipe is used to introduce the qualified products in each of the reactors into the finished product tank, and each of the second conveying pipes is equipped with a regulating valve. A branch pipe is connected to each of the second delivery pipes at both ends. An online analyzer is installed on the branch pipe, and a shut-off valve is installed on both sides of the online analyzer. The controller is connected to the online analyzer, each of the regulating valves, and each of the shut-off valves. The controller is configured to switch the opening and closing of each shut-off valve at set time intervals t to ensure that only one reactor's product is introduced into the online analyzer at any given time. Based on the concentration data measured in real time by the online analyzer, the controller determines whether the quality of the product from the corresponding reactor is qualified. If the product is qualified, the controller opens the regulating valve on the second delivery pipe corresponding to that reactor. If the product is unqualified, the controller closes or shuts the regulating valve.

2. The device for automatic switching and determination of sodium hypochlorite products according to claim 1, characterized in that: It also includes a circulation pump located at the outlet of the semi-finished product tank, the outlet of the circulation pump being connected to the feed inlet of each of the reactors, and the controller being connected to the circulation pump. The controller is further configured to: when the product is unqualified, start or increase the flow rate of the circulation pump to send the unqualified product back to the reactor for re-reaction.

3. The device for automatic switching and determination of sodium hypochlorite products according to claim 2, characterized in that: The circulating pump is a variable frequency pump.

4. The device for automatic switching and determination of sodium hypochlorite products according to claim 1, characterized in that: The set time t is 0.5h-3h.

5. The device for automatic switching and determination of sodium hypochlorite products according to claim 1, characterized in that: The reactor, semi-finished product tank, finished product tank, first conveying pipe, second conveying pipe, and branch pipe are all made of corrosion-resistant materials, namely polytetrafluoroethylene, polyvinylidene fluoride, or Hastelloy.

6. The device for automatic switching and determination of sodium hypochlorite products according to claim 1, characterized in that: The reactor is a sodium hypochlorite reactor.

7. The device for automatic switching and determination of sodium hypochlorite products according to claim 6, characterized in that: The online analyzer includes an online available chlorine analyzer and an online alkalinity analyzer.

8. The device for automatic switching and determination of sodium hypochlorite products according to claim 1, characterized in that: Both the semi-finished product tank and the finished product tank are equipped with level gauges, and the level gauges are connected to the controller via signal transmission.

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