Chloride ion concentration detection equipment

Abstract

The utility model discloses chloride ion concentration detection equipment, which belongs to the technical field of chloride ion detection and comprises a pH (potential of hydrogen) value adjusting system and a chloride ion concentration measuring system. The pH value adjusting system comprises a mixed solution container and a pH value adjusting device, wherein a plurality of solution conveying pipelines are arranged on the mixed solution container; the pumping device is connected to the solution conveying pipeline; the pH value measuring device is connected with the mixed solution container; the chloride ion concentration measuring system comprises a flow cell, a solution conveying pipeline, a mixed solution container and a control system, wherein the flow cell is communicated with the mixed solution container through the solution conveying pipeline; the chloride ion selective electrode is arranged in the flow cell; according to the chloride ion concentration detection equipment provided by the invention, the pH value adjusting system is matched with the chloride ion concentration measurement system, so that the influence of a residual urea solution in the equipment on a measurement result is eliminated, and the chloride ion concentration in the urea solution can be accurately measured.

Description

TECHNICAL FIELD

[0001] The utility model relates to chloride ion detection technical field more specifically, especially, it is a kind of chloride ion concentration detection equipment. BACKGROUND

[0002] In urea hydrolysis ammonia preparation process, urea hydrolyzer cylinder and heat exchanger coil often appear corrosion cracking phenomenon, and chloride ion is the main factor leading to corrosion;Urea solution is the only source of chloride ion, and chloride ion in urea solution is usually less than 1mg / L, and concentration is extremely low, but after continuous enrichment and concentration in the operation process of urea hydrolyzer, the concentration of chloride ion in urea solution can reach hundreds or even tens of thousands of milligrams per liter, far exceeding the critical concentration of 316L and other materials resistant to chloride ion corrosion;Therefore, it is necessary to detect the concentration of chloride ion in urea solution during the operation of urea hydrolyzer to adjust the operation condition, reduce the concentration of chloride ion in urea hydrolyzer and reduce the corrosion of equipment;At present, a chloride ion concentration detection equipment suitable for urea solution is urgently needed. UTILITY MODEL CONTENT

[0003] The utility model discloses a kind of chloride ion concentration detection equipment, which can accurately determine the concentration of chloride ion in urea solution.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A chloride ion concentration detection equipment, the chloride ion concentration detection equipment is connected with to-be-measured solution supply equipment, nitric acid solution supply equipment and desalted water supply equipment;The chloride ion concentration detection equipment includes a pH value adjusting system and a chloride ion concentration measuring system connected with the pH value adjusting system;

[0006] The pH value adjusting system includes:

[0007] A mixed solution container is provided with a plurality of solution delivery pipelines on the mixed solution container, and is respectively connected with to-be-measured solution supply equipment, nitric acid solution supply equipment and desalted water supply equipment through the solution delivery pipelines.

[0008] A pumping device is connected to the solution delivery pipeline.

[0009] A pH value measuring device is connected with the mixed solution container.

[0010] The chloride ion concentration measuring system includes:

[0011] A flow cell is connected between the mixed solution container and the solution delivery pipeline.

[0012] A chloride ion selective electrode is disposed in the flow cell.

[0013] Further, the mixed solution container is connected with a first waste liquid output pipeline, and the first waste liquid output pipeline is connected with a waste liquid conveying pump; the flow cell is connected with a second waste liquid output pipeline, and the second waste liquid output pipeline is connected with an emptying valve; one end of the second waste liquid output pipeline is communicated with the flow cell, and the other end is communicated with the first waste liquid output pipeline.

[0014] Further, the mixed solution container is connected with a first waste liquid output pipeline, and the first waste liquid output pipeline is connected with a waste liquid conveying pump; the flow cell is connected with a second waste liquid output pipeline, and the second waste liquid output pipeline is connected with an emptying valve; one end of the second waste liquid output pipeline is communicated with the flow cell, and the other end is communicated with the first waste liquid output pipeline.

[0015] Further, the mixed solution container is connected with a first waste liquid output pipeline, and the first waste liquid output pipeline is connected with a waste liquid conveying pump; the flow cell is connected with a second waste liquid output pipeline, and the second waste liquid output pipeline is connected with an emptying valve; one end of the second waste liquid output pipeline is communicated with the flow cell, and the other end is communicated with the first waste liquid output pipeline.

[0016] Further, the mixed solution container is connected with a first waste liquid output pipeline, and the first waste liquid output pipeline is connected with a waste liquid conveying pump; the flow cell is connected with a second waste liquid output pipeline, and the second waste liquid output pipeline is connected with an emptying valve; one end of the second waste liquid output pipeline is communicated with the flow cell, and the other end is communicated with the first waste liquid output pipeline.

[0017] Further, the mixed solution container is connected with a first waste liquid output pipeline, and the first waste liquid output pipeline is connected with a waste liquid conveying pump; the flow cell is connected with a second waste liquid output pipeline, and the second waste liquid output pipeline is connected with an emptying valve; one end of the second waste liquid output pipeline is communicated with the flow cell, and the other end is communicated with the first waste liquid output pipeline.

[0018] Further, the pH value measuring device adopts any one of a benchtop pH detector, an industrial online pH meter and a pen-type pH detector.

[0019] The chloride ion concentration detection equipment provided in the embodiment of the utility model cooperates with the pH value adjusting system and the chloride ion concentration measuring system, eliminates the influence of residual urea solution in the equipment on the determination result, can accurately determine the chloride ion concentration in the urea solution, and is connected with the desalted water supply equipment, uses the desalted water to cool the urea solution, ensures that the temperature of the urea solution is in the working temperature range of the chloride ion electrode, and further guarantees the accuracy of the determination result. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a chloride ion concentration detection equipment schematic view provided in the embodiment of the utility model;

[0021] The marks in the drawing are shown as follows:

[0022] 1, pH value adjusting system;

[0023] 11, mixed solution container; 111, solution to be measured delivery pipe; 112, nitric acid solution delivery pipe; 113, desalted water delivery pipe; 114, solution to be measured delivery pump; 115, nitric acid solution delivery pump; 116, desalted water delivery pump; 117, first waste liquid output pipe; 118, waste liquid delivery pump; 119, overflow pipe; 12, pH value measuring device; 13, stirring device; 14, exhaust pipe;

[0024] 2, chloride ion concentration measuring system;

[0025] 21, flow cell; 211, mixed solution delivery pipe; 212, mixed solution delivery pump; 213, second waste liquid output pipe; 214, emptying valve; 22, chloride ion selective electrode; 221, wire; 222, reading device. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the same or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously meet the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0030] Please refer to Figure 1 The embodiment of the application shown provides a kind of chloride ion concentration detection equipment, chloride ion concentration detection equipment is connected with to-be-measured solution supply equipment, nitric acid solution supply equipment and desalted water supply equipment in practical application, utilizes ion selective electrode method to determine the chloride ion concentration in mixed solution;Equipment measurement concentration range is wide, electrode sensitivity is high, suitable for the determination task of chloride ion concentration in urea solution.

[0031] Chloride ion concentration detection equipment includes: pH value adjusting system 1 and chloride ion concentration measurement system 2;Wherein, pH value adjusting system 1 is used to adjust the urea solution output by to-be-measured solution supply equipment to be acidic, to eliminate the interference caused by a large number of free ammonia and carbonate in urea solution when concentration determination;pH value adjusting system 1 includes: mixed solution container 11, pumping device and pH value measuring device 12;Multiple solution delivery pipelines are provided on mixed solution container 11, and mixed solution container 11 is communicated with to-be-measured solution supply equipment, nitric acid solution supply equipment and desalted water supply equipment through solution delivery pipeline respectively;Pumping device is connected on solution delivery pipeline;

[0032] More specifically, the solution delivery pipeline in the technical solution comprises: a test solution delivery pipeline 111 connected between a test solution supply device and the mixed solution container 11, a nitric acid solution delivery pipeline 112 connected between a nitric acid solution supply device and the mixed solution container 11, and a desalted water delivery pipeline 113 connected between a desalted water supply device and the mixed solution container 11; the pumping device comprises: a test solution delivery pump 114 connected to the test solution delivery pipeline 111, a nitric acid solution delivery pump 115 connected to the nitric acid solution delivery pipeline 112, and a desalted water delivery pump 116 connected to the desalted water delivery pipeline 113; the pumping device corresponding to the solution delivery pipeline is controlled to pump the specified solution into the mixed solution container 11; as a preferred embodiment of the present application, the pumping device is a metering pump, so as to accurately control the flow rate of the solution in the solution delivery pipeline.

[0033] The pH measuring device 12 is connected to the mixed solution container 11, so that the operator can obtain the pH value of the mixed solution in the mixed solution container 11 in real time through the pH measuring device 12, thereby controlling the start-stop state of the nitric acid solution delivery pump 115 according to the pH value of the mixed solution; as an embodiment of the present application, the pH measuring device 12 can be any one of a benchtop pH detector, an industrial online pH meter, and a pen-type pH detector.

[0034] In the above technical solution, the mixed solution container 11 is connected to the desalted water supply device, which has two purposes: on the one hand, it is to clean the solution delivery pipeline, the mixed solution container 11, and the chloride ion concentration measuring system 2 by passing in desalted water before passing in the test solution, so as to remove the residual urea solution and reduce the detection error; on the other hand, it is to absorb the heat in the urea solution by passing in desalted water after passing in the test solution, so as to achieve the effect of cooling and avoid the flash evaporation of the urea solution in the mixed solution container 11.

[0035] The mixed solution container 11 is connected to the nitric acid solution supply device, which is to convert NH3 in the urea solution into NH4 + by nitric acid, and convert CO3 2- into CO2, so as to eliminate the interference of free ammonia and carbonic acid on the measurement result of the chloride ion concentration when the urea solution enters the chloride ion concentration measuring system.

[0036] In the present embodiment, in order to uniformly mix the liquid in the mixed solution container 11, a stirring device 13 is arranged in the mixed solution container 11, the stirring device 13 is located at the bottom of the mixed solution container 11, and a space for accommodating the pH measuring device 12 is left above the stirring device 13.

[0037] The top of the mixed solution container 11 is provided with an exhaust pipe 14; while the liquid is gradually injected into the mixed solution container 11, the gas in the mixed solution container 11 is discharged through the exhaust pipe 14.

[0038] The bottom of the mixed solution container 11 is connected with a first waste liquid output pipe 117, and the first waste liquid output pipe 117 is connected with a waste liquid conveying pump 118; the waste liquid generated after the desalted water cleaning is completed, and the remaining waste liquid in the mixed solution container 11 after the chloride ion concentration detection is completed, are all discharged through the first waste liquid output pipe 117.

[0039] The side wall of the mixed solution container 11 is connected with an overflow pipe 119, one end of the overflow pipe 119 is connected with the mixed solution container 11, and the other end is connected with the first waste liquid output pipe 117; the overflow pipe 119 is used for guiding the excess mixed solution, so that the liquid level in the mixed solution container 11 is kept within a set range; when the liquid level is too low, the liquid level can be restored to the normal range by supplementing the liquid; the height of the overflow pipe 119 connected with the mixed solution container 11 is determined according to the actual capacity of the mixed solution container 11.

[0040] In the above technical solution, the solution conveying pipe further includes a mixed solution conveying pipe 211, in order to further measure the chloride ion concentration of the mixed solution in the mixed solution container 11; the chloride ion concentration measuring system 2 includes a flow cell 21 and a chloride ion selective electrode 22; wherein the flow cell 21 and the mixed solution container 11 are connected through the mixed solution conveying pipe 211, and the mixed solution conveying pipe 211 is connected with a mixed solution conveying pump 212, which is used for pumping the liquid in the mixed solution container 11 into the flow cell 21; the flow cell 21 is further connected with a second waste liquid output pipe 213, one end of the second waste liquid output pipe 213 is connected with the bottom of the flow cell 21, and the other end is connected with the first waste liquid output pipe 117; the second waste liquid output pipe 213 is connected with an emptying valve 214, which is opened to empty the waste liquid in the flow cell 21, and the waste liquid leaves the flow cell 21 and flows into the first waste liquid output pipe 117, and is discharged from the device together with the waste liquid in the mixed solution container 11.

[0041] The chloride ion selective electrode 22 is arranged in the flow cell 21; it can be understood that one end of the chloride ion selective electrode 22 is connected with a reading device 222 through a wire 221; in the embodiment, the wire 221 adopts a low-noise shielded wire, and the reading device 222 adopts a potentiometer; the technical scheme of the application utilizes an ion selective electrode (ISE) to measure the chloride ion concentration based on the selective reaction between the electrode surface and the chloride ion; when the chloride ion and the electrode surface have the selective reaction, the potential of the electrode surface changes, and the change is acquired through the potentiometer; thereby the technical effect of measuring the chloride ion concentration in the mixed solution through the potential difference is realized.

[0042] Working principle: before detection, the pumping device and the emptying valve 214 are both in the closed state; the to-be-detected solution is pumped into the mixed solution container 11 through the to-be-detected solution conveying pipeline 111 by the to-be-detected solution conveying pump 114 with a quantitative conveying function;

[0043] The nitric acid solution is pumped into the mixed solution container 11 through the nitric acid solution conveying pipeline 112 by the nitric acid solution conveying pump 115 with a quantitative conveying function, and at the same time, the stirring device 13 is started to uniformly mix the liquid in the mixed solution container 11; the pH value of the mixed solution is detected by the pH value measuring device 12, and if the pH value < 4, the nitric acid solution conveying pump 115 and the stirring device 13 are closed;

[0044] The desalted water is pumped into the mixed solution container 11 through the desalted water conveying pipeline 113 by the desalted water conveying pump 116 with a quantitative conveying function, and after the liquid level height of the mixed solution reaches the height at which the overflow pipeline 119 is connected with the mixed solution container 11, the desalted water conveying pump 116 is closed; at the same time of pumping the desalted water, the stirring device 13 is started to uniformly stir the mixed solution, and then the stirring device 13 is closed;

[0045] The mixed solution in the mixed solution container 11 is pumped into the flow cell 21 through the mixed solution conveying pipeline 211 by the mixed solution conveying pump 212 with a quantitative conveying function, and at the same time, the emptying valve 214 is opened, the chloride ion concentration in the mixed solution is detected by the chloride ion selective electrode 22, and the reading is read by the reading device 222; after the stable value is acquired, the mixed solution conveying pump 212 is closed, the waste liquid conveying pump 118 is opened, and the waste liquid in the flow cell 21 and the mixed solution container 11 is emptied; the determination of the chloride ion concentration in the to-be-detected solution is completed;

[0046] After the determination of the concentration of chloride ions in the solution to be tested is completed, the waste liquid delivery pump 118 is closed, the desalinated water delivery pump 116 is opened, and after the desalinated water fills the mixed solution container 11, the waste liquid delivery pump 118 is opened to clean the mixed solution container 11 with the desalinated water; after the cleaning of the mixed solution container 11 is completed, the waste liquid delivery pump 118 is closed, and the mixed solution delivery pump 212 is opened to clean the flow cell 21 with the desalinated water; during the cleaning process, the emptying valve 214 is closed so that the flow cell 21 is filled with the desalinated water; finally, the emptying valve 214, the waste liquid delivery pump 118, and the desalinated water delivery pump 116 are opened, and after the liquids in the flow cell 21 and the mixed solution container 11 are exhausted, the emptying valve 214 and the waste liquid delivery pump 118 are closed, and the equipment enters a standby state.

[0047] The chloride ion concentration detection equipment provided by the present application is matched with the pH value adjusting system 1 and the chloride ion concentration measuring system 2, the influence of residual urea solution in the equipment on the determination result is eliminated, the chloride ion concentration in the urea solution can be accurately determined, and the urea solution is cooled by the desalinated water supplied by the desalinated water supply equipment, the flash evaporation phenomenon during the direct determination of the chloride ion concentration in the urea solution is effectively avoided, and the accuracy of the determination result is further ensured.

[0048] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A chloride ion concentration detecting apparatus characterized by comprising: The chloride ion concentration detection device is connected with a to-be-measured solution supply device, a nitric acid solution supply device and a desalted water supply device; the chloride ion concentration detection device comprises a pH value adjusting system and a chloride ion concentration measuring system connected with the pH value adjusting system; The pH value adjusting system comprises: A mixed solution container is provided with a plurality of solution delivery pipelines, and is connected in communication with the to-be-measured solution supply device, the nitric acid solution supply device and the desalted water supply device through the solution delivery pipelines; A pumping device is connected to the solution delivery pipelines; A pH value measuring device is connected with the mixed solution container; The chloride ion concentration measuring system comprises: A flow cell is connected in communication between the mixed solution container and the solution delivery pipelines; A chloride ion selective electrode is arranged in the flow cell.

2. The chloride ion concentration detecting apparatus according to claim 1, wherein A first waste liquid output pipeline is connected to the mixed solution container, and a waste liquid delivery pump is connected to the first waste liquid output pipeline; a second waste liquid output pipeline is connected to the flow cell, and a vent valve is connected to the second waste liquid output pipeline, one end of the second waste liquid output pipeline is connected in communication with the flow cell, and the other end is connected in communication with the first waste liquid output pipeline.

3. The chloride ion concentration detecting apparatus according to claim 1, wherein A stirring device is arranged in the mixed solution container, and the stirring device is located at the bottom of the mixed solution container.

4. The chloride ion concentration detecting apparatus according to claim 1, wherein An exhaust pipe is arranged at the top of the mixed solution container.

5. The chloride ion concentration detecting apparatus according to claim 2, wherein An overflow pipeline is connected to the sidewall of the mixed solution container, one end of the overflow pipeline is connected in communication with the mixed solution container, and the other end is connected in communication with the first waste liquid output pipeline.

6. The chloride ion concentration detecting apparatus according to claim 1, wherein A reading device is arranged at the end of the chloride ion selective electrode, and the reading device and the chloride ion selective electrode are connected through a low-noise shielding line.

7. The chloride ion concentration detecting apparatus according to claim 1, wherein The pH value measuring device adopts any one of a benchtop pH detector, an industrial online pH meter and a pen-type pH detector.

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