System for measuring content of chloride ions in urea for power plant

Abstract

The utility model discloses a system for measuring the content of chloride ions in urea for a power plant, which is characterized in that a heater is positioned on a weighing sensor, a measuring reaction cup is positioned on the heater and is of a transparent structure, and a liquid level sensor and a color sensor are arranged on the outer wall of the measuring reaction cup; a stirrer and a temperature sensor are arranged in the measuring reaction cup, and a sample adding hopper is arranged at the top of the measuring reaction cup; an outlet of the high-purity water tank, an outlet of the nitric acid solution tank, an outlet of the silver nitrate solution tank, an outlet of the dibutyl phthalate tank, an outlet of the ammonium ferric sulfate solution tank and an outlet of the ammonium thiocyanate solution tank are communicated with the measurement reaction cup. The system can accurately measure the content of chloride ions in urea.

Description

Technical Field

[0001] This utility model belongs to the field of sample testing in power generation technology, and relates to a system for measuring the chloride ion content in urea used in power plants. Background Technology

[0002] With my country's increasing emphasis on environmental protection, flue gas desulfurization and denitrification processes in power plants have become a key focus for various power plants. Many power plants have successfully implemented urea-to-ammonia technology for denitrification retrofitting, using urea instead of liquid ammonia as the denitrification reducing agent. This not only reduces nitrogen oxide emissions but also improves the safety and stability of environmental protection equipment. Therefore, ensuring the quality of urea is crucial for the safe and stable operation of denitrification equipment. Chloride ion content is one of the important indicators for urea in power plants. Chloride ions are corrosive, and excessively high chloride ion content can cause corrosion and damage to production equipment, especially in high-pressure equipment used in urea production. Chloride ions easily lead to stress corrosion, pitting corrosion, and intergranular corrosion, seriously affecting the safe operation of the equipment. By detecting the chloride ion content in urea, potential corrosion problems can be detected and addressed in a timely manner, extending the service life of equipment and reducing maintenance costs. During urea production, excessively high chloride ion content will reduce the quality of urea products and may even cause products to fail to meet standards. As the users of urea, power plants can ensure that the quality of the urea they use meets production requirements by detecting the chloride ion content, thereby guaranteeing stable and efficient denitrification. Therefore, accurate measurement of chloride ion content in urea from power plants is crucial.

[0003] Currently, the chloride ion content in urea from power plants is mainly determined manually, which is cumbersome and has low measurement accuracy. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a system for measuring the chloride ion content in urea used in power plants. This system can accurately measure the chloride ion content in urea.

[0005] To achieve the above objectives, this utility model discloses a system for measuring chloride ion content in urea used in power plants, including a heater, a weighing sensor, a measuring reaction cup, a high-purity water tank, a nitric acid solution tank, a silver nitrate solution tank, a dibutyl phthalate tank, a ferric ammonium sulfate solution tank, and an ammonium thiocyanate solution tank.

[0006] The heater is located on the weighing sensor, and the measuring reaction cup is located on the heater. The measuring reaction cup has a transparent structure. A liquid level sensor and a color sensor are installed on the outer wall of the measuring reaction cup. A stirrer and a temperature sensor are installed inside the measuring reaction cup. A sample addition hopper is installed on the top of the measuring reaction cup. The outlets of the high-purity water tank, the nitric acid solution tank, the silver nitrate solution tank, the dibutyl phthalate tank, the ferric ammonium sulfate solution tank, and the ammonium thiocyanate solution tank are connected to the measuring reaction cup.

[0007] A further improvement of the chloride ion content measurement system for urea used in power plants described in this utility model is as follows:

[0008] Furthermore, a drain valve is installed at the drain port at the bottom of the measuring reaction cup.

[0009] Furthermore, the high-purity water tank is connected to the measuring reaction cup via a high-purity water pump.

[0010] Furthermore, the nitric acid solution tank is connected to the measuring reaction cup via a nitric acid solution metering pump.

[0011] Furthermore, the silver nitrate solution tank is connected to the measuring reaction cup via a silver nitrate solution metering pump.

[0012] Furthermore, the dibutyl phthalate tank is connected to the measuring reaction cup via a dibutyl phthalate metering pump.

[0013] Furthermore, the ferric ammonium sulfate solution tank is connected to the measuring reaction cup via a ferric ammonium sulfate solution metering pump.

[0014] Furthermore, the ammonium thiocyanate solution tank is connected to the measuring reaction cup via an ammonium thiocyanate solution pump.

[0015] Furthermore, it also includes a control and display, which is connected to a stirrer, a temperature sensor, a level sensor, a color sensor, a drain valve, a weighing sensor, a high-purity water pump, a nitric acid solution metering pump, a silver nitrate solution metering pump, a dibutyl phthalate metering pump, a ferric ammonium sulfate solution metering pump, and an ammonium thiocyanate solution pump.

[0016] Furthermore, it also includes a support component, on which the weighing sensor is located, and the upper ends of the temperature sensor and the stirrer are both suspended on the support component.

[0017] This utility model has the following beneficial effects:

[0018] In specific operation, the chloride ion content measurement system for urea used in power plants described in this utility model has a sample addition hopper at the top of the measuring reaction cup. The outlets of the high-purity water tank, nitric acid solution tank, silver nitrate solution tank, dibutyl phthalate tank, ferric ammonium sulfate solution tank, and ammonium thiocyanate solution tank are connected to the measuring reaction cup. Reagents are added to the measuring reaction cup through the high-purity water tank, nitric acid solution tank, silver nitrate solution tank, dibutyl phthalate tank, ferric ammonium sulfate solution tank, and ammonium thiocyanate solution tank. With the help of a liquid level sensor and a color sensor, the chloride ion content in urea can be measured. The measurement accuracy is high and the system is highly practical. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a structural diagram of the present invention.

[0021] Among them, 1 is the measuring reaction cup, 2 is the stirrer, 3 is the temperature sensor, 4 is the sample addition hopper, 5 is the liquid level sensor, 6 is the color sensor, 7 is the drain valve, 8 is the heater, 9 is the weighing sensor, 10 is the support component, 11 is the control and display, 12 is the high-purity water tank, 13 is the high-purity water pump, 14 is the nitric acid solution tank, 15 is the nitric acid solution metering pump, 16 is the silver nitrate solution tank, 17 is the silver nitrate solution metering pump, 18 is the dibutyl phthalate tank, 19 is the dibutyl phthalate metering pump, 20 is the ferric ammonium sulfate solution tank, 21 is the ferric ammonium sulfate solution metering pump, 22 is the ammonium thiocyanate solution tank, and 23 is the ammonium thiocyanate solution pump. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0026] It should be understood that although terms such as first, second, third, etc., may be used to describe preset ranges in the embodiments of this utility model, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of this utility model, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0027] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] The accompanying drawings show various structural schematic diagrams according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0030] refer to Figure 1 The chloride ion content measurement system for urea used in power plants described in this utility model includes a measuring reaction cup 1, a stirrer 2, a temperature sensor 3, a sample addition hopper 4, a liquid level sensor 5, a color sensor 6, a drain valve 7, a heater 8, a weighing sensor 9, a support component 10, a control and display 11, a high-purity water tank 12, a high-purity water pump 13, a nitric acid solution tank 14, a nitric acid solution metering pump 15, a silver nitrate solution tank 16, a silver nitrate solution metering pump 17, a dibutyl phthalate tank 18, a dibutyl phthalate metering pump 19, a ferric ammonium sulfate solution tank 20, a ferric ammonium sulfate solution metering pump 21, an ammonium thiocyanate solution tank 22, and an ammonium thiocyanate solution pump 23.

[0031] The heater 8 is located on the weighing sensor 9, and the measuring reaction cup 1 is located on the heater 8. The heater 8 heats the liquid in the measuring reaction cup 1. The measuring reaction cup 1 has a transparent structure. A liquid level sensor 5 and a color sensor 6 are installed on the outer wall of the measuring reaction cup 1. A stirrer 2 and a temperature sensor 3 are installed inside the measuring reaction cup 1. A sample addition hopper 4 is installed at the top of the measuring reaction cup 1, and a drain valve 7 is installed at the drain outlet at the bottom of the measuring reaction cup 1.

[0032] The high-purity water tank 12 is connected to the measuring reaction cup 1 via the high-purity water pump 13;

[0033] The nitric acid solution tank 14 is connected to the measuring reaction cup 1 via the nitric acid solution metering pump 15;

[0034] The silver nitrate solution tank 16 is connected to the measuring reaction cup 1 via the silver nitrate solution metering pump 17;

[0035] The dibutyl phthalate tank 18 is connected to the measuring reaction cup 1 via the dibutyl phthalate metering pump 19;

[0036] The ferric ammonium sulfate solution tank 20 is connected to the measuring reaction cup 1 via the ferric ammonium sulfate solution metering pump 21;

[0037] The ammonium thiocyanate solution tank 22 is connected to the measuring reaction cup 1 via the ammonium thiocyanate solution pump 23.

[0038] In this embodiment, a support component 10 is also included. The weighing sensor 9 is located on the support component 10, and the upper end of the temperature sensor 3 and the upper end of the stirrer 2 are both suspended on the support component 10.

[0039] The control and display 11 is connected to the stirrer 2, temperature sensor 3, liquid level sensor 5, color sensor 6, drain valve 7, weighing sensor 9, high-purity water pump 13, nitric acid solution metering pump 15, silver nitrate solution metering pump 17, dibutyl phthalate metering pump 19, ferric ammonium sulfate solution metering pump 21, and ammonium thiocyanate solution pump 23.

[0040] The measurement principle of this invention is as follows: Urea granules are dissolved in water at high temperature and then placed in a slightly acidic solution. An excess of silver nitrate solution is added to convert chloride ions into silver chloride precipitate. The precipitate is coated with dibutyl phthalate. Ferric ammonium sulfate is used as an indicator, and the remaining silver nitrate is titrated with ammonium thiocyanate solution. When all the silver nitrate is consumed, a slight excess of thiocyanate ions will react with ferric ions to form a red complex. When the water sample turns light orange-red or light brick-red, the titration endpoint is reached.

[0041] refer to Figure 1 The specific working process of this utility model is as follows:

[0042] Take the urea sample to be tested and add it to the measuring reaction cup 1 through the sample addition hopper 4. Weigh the sample using the weighing sensor 9 and record the mass as m1. Perform a tare and zeroing operation before each weighing to ensure the accuracy of the sample weighing. Start the high-purity water pump 13 to add high-purity water to the measuring reaction cup 1. Control the amount of high-purity water added using the liquid level sensor 5 to ensure that the volume of the water sample in the measuring reaction cup 1 is 250mL. Slowly heat the water sample to boiling using the heater 8 and stir it using the stirrer 2. Measure the temperature of the water sample in the measuring reaction cup 1 using the temperature sensor 3. When the water sample temperature rises to 100℃, maintain heating for 10 minutes. After 10 minutes, stop heating and wait for the water sample to cool to room temperature. Start the high-purity water pump 13 again to add high-purity water to the measuring reaction cup 1. Control the amount of high-purity water added using the liquid level sensor 5 to ensure that the volume of the water sample in the measuring reaction cup 1 is 250mL. Start the nitric acid solution metering pump 15 to add 5 mL of nitric acid solution to the measuring reaction vessel 1. Start the silver nitrate solution metering pump 17 to add 25 mL of silver nitrate solution to the measuring reaction vessel 1. Start the stirrer 2. After 5 minutes, start the dibutyl phthalate metering pump 19 to add 5 mL of dibutyl phthalate to the measuring reaction vessel 1. Start the ferric ammonium sulfate solution metering pump 21 to add 2 mL of ferric ammonium sulfate solution to the measuring reaction vessel 1. Start the ammonium thiocyanate solution pump 23 to titrate the remaining silver nitrate. Use the color sensor 6 to identify the color of the water sample. When the water sample turns light orange-red or light brick red, the titration endpoint is identified. Stop the ammonium thiocyanate solution pump 23 and record the volume of ammonium thiocyanate solution consumed at this time as V1. The measurement is complete. After the measurement is completed, open the drain valve 7 and the high-purity water pump 13 to clean the measuring reaction vessel 1.

[0043] Chloride ion content is expressed as a mass fraction w1, in %, and the chloride ion content w1 is:

[0044]

[0045] Wherein, V0 is the volume of ammonium thiocyanate consumed in 25 mL of silver nitrate solution, in milliliters (mL). This value has been calibrated before the system leaves the factory, and the set value has been set in the system. V1 is the volume of ammonium thiocyanate consumed when titrating the sample, in milliliters (mL); c is the concentration of the prepared ammonium thiocyanate solution, in mol / L; m1 is the mass of the sample taken, in grams (g); and 0.03545 is the millimolecular mass of chloride ions, in grams per millimole (g / mmol).

[0046] It should be noted that the drain valve 7 is an electric valve. The opening and closing of the drain valve 7 is controlled by the built-in program of the control and display 11, and no manual operation is required.

[0047] The high-purity water pump 13 is an electromagnetic pump; the nitric acid solution metering pump 15, the silver nitrate solution metering pump 17, the dibutyl phthalate metering pump 19, and the ferric ammonium sulfate solution metering pump 21 are all metering pumps; they can add solutions quantitatively according to the set volume; the ammonium thiocyanate solution pump 23 is a high-precision pump such as a plunger pump or a metering pump, which can accurately control and display the volume.

[0048] Other embodiments of this utility model will readily conceive of by those skilled in the art upon consideration of the specification and disclosure thereof. This application is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this utility model are indicated by the following claims.

[0049] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

[0050] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A system for measuring the chloride ion content in urea for power plants, characterized by, The device comprises a heater (8), a weighing sensor (9), a measuring reaction cup (1), a high-purity water tank (12), a nitric acid solution tank (14), a silver nitrate solution tank (16), a dibutyl phthalate tank (18), an iron ammonium sulfate solution tank (20), and an ammonium thiocyanate solution tank (22); The heater (8) is located on the weighing sensor (9), and the measuring reaction cup (1) is located on the heater (8). The measuring reaction cup (1) is transparent, and a liquid level sensor (5) and a color sensor (6) are arranged on the outer wall of the measuring reaction cup (1). A stirrer (2) and a temperature sensor (3) are arranged in the measuring reaction cup (1), and a sample adding hopper (4) is arranged on the top of the measuring reaction cup (1). The outlet of the high-purity water tank (12), the outlet of the nitric acid solution tank (14), the outlet of the silver nitrate solution tank (16), the outlet of the dibutyl phthalate tank (18), the outlet of the iron ammonium sulfate solution tank (20), and the outlet of the ammonium thiocyanate solution tank (22) are connected with the measuring reaction cup (1).

2. The system for measuring the chloride ion content of urea for power plants according to claim 1, characterized in that, A blowdown valve (7) is arranged at the blowdown port of the bottom of the measuring reaction cup (1).

3. The system for measuring chloride ion content in urea for power plants according to claim 2, characterized in that, The high-purity water tank (12) is connected with the measuring reaction cup (1) through a high-purity water pump (13).

4. The system for measuring chloride ion content in urea for power plants according to claim 3, characterized in that, The nitric acid solution tank (14) is connected with the measuring reaction cup (1) through a nitric acid solution metering pump (15).

5. The system for measuring chloride ion content in urea for power plants according to claim 4, characterized in that, The silver nitrate solution tank (16) is connected with the measuring reaction cup (1) through a silver nitrate solution metering pump (17).

6. The system for measuring chloride ion content in urea for power plants according to claim 5, characterized in that, The dibutyl phthalate tank (18) is connected with the measuring reaction cup (1) through a dibutyl phthalate metering pump (19).

7. The system for measuring chloride ion content in urea for power plants according to claim 6, characterized in that, The iron ammonium sulfate solution tank (20) is connected with the measuring reaction cup (1) through an iron ammonium sulfate solution metering pump (21).

8. The system for measuring chloride ion content in urea for power plants according to claim 7, characterized in that, The ammonium thiocyanate solution tank (22) is connected with the measuring reaction cup (1) through an ammonium thiocyanate solution pump (23).

9. The system for measuring chloride ion content in urea for power plants according to claim 8, characterized in that, The device further comprises a control and display device (11), which is connected with the stirrer (2), the temperature sensor (3), the liquid level sensor (5), the color sensor (6), the blowdown valve (7), the weighing sensor (9), the high-purity water pump (13), the nitric acid solution metering pump (15), the silver nitrate solution metering pump (17), the dibutyl phthalate metering pump (19), the iron ammonium sulfate solution metering pump (21), and the ammonium thiocyanate solution pump (23).

10. The urea chloride ion content measuring system for power plants according to claim 1, characterized by, The device further comprises a support member (10), and the weighing sensor (9) is located on the support member (10). The upper end of the temperature sensor (3) and the upper end of the stirrer (2) are both suspended on the support member (10).

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