Direct sampling and weighing system for dust content of tail gas

Abstract

The utility model discloses a tail gas dust content direct sampling and weighing system, and belongs to the technical field of tail gas dust content detection. Comprising a sampling device, a weighing device and a constant-temperature drying box, the sampling device comprises a sampling valve, a connecting pipe, a double-ball drying sampling pipe, a pressure transmitter, a temperature sensor and a gas flowmeter; one end of the connecting pipe is detachably connected with the sampling valve, and the other end of the connecting pipe is connected with the tail gas treatment device; a pressure transmitter, a temperature sensor, a gas flow meter and a double-ball drying sampling pipe are sequentially arranged on the connecting pipe; the two ends of the double-ball drying sampling tube are open, and the double-ball drying sampling tube is filled with absorbent cotton; the weighing device can be used for weighing the double-ball drying sampling tube, and the constant-temperature drying box is used for controlling the temperature of the double-ball drying sampling tube and keeping a dry environment. The technical problem that the detection accuracy is low due to the fact that a traditional tail gas dust content detection device and method are indirect detection and do not consider the water pressure in gas is solved.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas dust detection technology, and in particular to a direct sampling and weighing system for exhaust gas dust content. Background Technology

[0002] Currently, the main methods for measuring dust content in coal gas (tail gas) include capacitance measurement, X-ray measurement, ultrasonic measurement, microwave measurement, optical measurement, and charge induction measurement, each with its own advantages and disadvantages. These are primarily indirect measurement methods, with some employing direct weighing via filter membrane sampling. However, these methods do not consider the influence of moisture (gas temperature) weight on dust weight, nor do they consider the influence of gas pressure (gas volume) on gas size. Comparing direct and indirect measurement methods, direct measurement can eliminate misjudgments due to bag breakage, enabling effective monitoring and comparison of the accuracy of online dust content measurement.

[0003] Therefore, it is necessary to invent a direct sampling and weighing system for dust content in coal gas (tail gas) to provide a more reliable monitoring method. Summary of the Invention

[0004] The purpose of this invention is to provide a direct sampling and weighing system for exhaust gas dust content, addressing the aforementioned problems. This system solves the technical problem that traditional exhaust gas dust content detection devices and methods are indirect and do not consider the influence of the weight of moisture (gas temperature) on the weight of dust, nor the influence of gas pressure (gas volume) on the gas volume, resulting in low detection accuracy.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A direct sampling and weighing system for dust content in exhaust gas includes a sampling device, a weighing instrument, and a constant temperature drying oven. The sampling device includes a sampling valve, a connecting pipe, a double-ball drying sampling tube, a pressure transmitter, a temperature sensor, and a gas flow meter. The sampling valve is installed at the sampling point of the exhaust gas main pipe. One end of the connecting pipe is detachably connected to the sampling valve, and the other end is connected to the exhaust gas treatment device. The pressure transmitter, temperature sensor, gas flow meter, and double-ball drying sampling tube are sequentially arranged on the connecting pipe. The double-ball drying sampling tube is open at both ends and filled with degreased cotton. The weighing instrument can be used to weigh the double-ball drying sampling tube, and the constant temperature drying oven is used for temperature control of the double-ball drying sampling tube and to maintain a dry environment.

[0007] Furthermore, it also includes a data processor, which has a built-in dust content calculation formula and is equipped with several interfaces, which are respectively connected to the corresponding weighing device, pressure transmitter, temperature sensor and gas flow meter.

[0008] Furthermore, the data processor is equipped with a manual input button, which can be used to input or modify data parameters.

[0009] Furthermore, the double-sphere drying sampling tube has two spherical receiving cavities in the middle, and the spherical receiving cavities are filled with degreased cotton.

[0010] Furthermore, the openings at both ends of the dual-sphere drying sampling tube are provided with sealing plugs, and the connecting tube penetrates the sealing plugs to communicate with the interior of the dual-sphere drying sampling tube.

[0011] Furthermore, the sampling device also includes a support, on which an inclined placement part is provided, and the double-ball drying sampling tube can be placed on the placement part and is inclined.

[0012] Furthermore, the sampling device also includes an outer casing, with an inlet at the top of the outer casing and the bracket installed inside the outer casing; a side door is provided on one side of the outer casing, and an observation window is provided on the side door.

[0013] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0014] 1. In use, this utility model uses a sampling device to sample the exhaust gas. The dust in the exhaust gas can be collected through a double-ball drying sampling tube, and the amount of dust can be directly detected. The constant temperature drying oven reduces the interference of moisture in the dust. The pressure transmitter, temperature sensor and gas flow meter detect the gas pressure, temperature and flow respectively. By introducing gas temperature parameters and gas pressure parameters into the dust content calculation formula, the influence of dust moisture weight and gas pressure on dust content is reduced, and the accuracy of dust content is improved.

[0015] 2. This utility model addresses the issue of manual sampling and weighing of dust content. It employs a data processor with a pre-set calculation formula to input or store relevant parameters of the sampled gas, including the weight of the dust sample, the volume of the exhaust gas flowing through the sampler, the temperature of the exhaust gas passing through the flow meter, the gas pressure at the time of sampling, the saturated vapor pressure of water at t℃, and the flow meter correction coefficient, in the data processor to achieve high-precision output of exhaust gas dust content data.

[0016] 3. This utility model is equipped with a support and an outer casing. The support facilitates the placement of the double-ball drying sampling tube, and the outer casing allows for centralized storage of the device system, making it convenient to store the system device. The outer casing is equipped with a side-opening door, which facilitates the retrieval of the internal items and the observation of the internal condition. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system structure of this utility model;

[0018] Figure 2This is a schematic diagram of the sampling device of this utility model.

[0019] In the attached diagram, 100-exhaust gas main pipe, 1-sampling device, 2-weighing device, 3-constant temperature drying oven, 4-data processor, 5-exhaust gas treatment device, 11-sampling valve, 12-connecting pipe, 13-double-ball drying sampling tube, 14-pressure transmitter, 15-temperature sensor, 16-gas flow meter, 17-support, 18-outer casing, 41-manual input button, 131-spherical receiving cavity, 132-degreased cotton, 133-sealing rubber plug, 181-side opening door, 182-observation window. Detailed Implementation

[0020] The specific implementation of the utility model will be further described below with reference to the accompanying drawings.

[0021] In the description of this utility model, it should be understood that the terms "center", "length", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Please see Figure 1 and Figure 2A direct sampling and weighing system for dust content in exhaust gas includes a sampling device 1, a weighing device 2, and a constant temperature drying oven 3. The sampling device 1 includes a sampling valve 11, a connecting pipe 12, a double-ball drying sampling tube 13, a pressure transmitter 14, a temperature sensor 15, and a gas flow meter 16. The sampling valve 11 is installed at the sampling point of the exhaust gas main pipe 100. One end of the connecting pipe 12 is detachably connected to the sampling valve 11, and the other end is connected to the exhaust gas treatment device 5. The pressure transmitter 14, temperature sensor 15, gas flow meter 16, and double-ball drying sampling tube 13 are sequentially arranged on the connecting pipe 12. The double-ball drying sampling tube 13 is open at both ends and filled with degreased cotton 132. The weighing device 2 can be used to weigh the double-ball drying sampling tube 13, and the constant temperature drying oven 3 is used for temperature control of the double-ball drying sampling tube 13 and to maintain a dry environment. Specifically, the weighing device 2 is an electronic analytical balance with a sensitivity of 0.0001g, and the temperature of the constant temperature drying oven 3 is adjustable. The constant temperature drying oven 3 is filled with color-changing silica gel or anhydrous calcium chloride.

[0025] This embodiment also includes a data processor 4, which has a built-in dust content calculation formula and several interfaces that are connected to the corresponding weighing device 2, pressure transmitter 14, temperature sensor 15, and gas flow meter 16. Specifically, the data processor 4 is equipped with a manual input button 41, which allows for the input or modification of data parameters.

[0026] In this embodiment, the double-sphere drying sampling tube 13 has two spherical receiving cavities 131 in the middle, and the spherical receiving cavities 131 are filled with degreased cotton 132. The openings at both ends of the double-sphere drying sampling tube 13 are provided with sealing plugs 133, and the connecting tube 12 penetrates the sealing plugs 133 and communicates with the inside of the double-sphere drying sampling tube 13.

[0027] In this embodiment, the sampling device 1 also includes a support 17, on which an inclined placement part is provided, and the double-ball drying sampling tube 13 can be placed on the placement part and is inclined.

[0028] In this embodiment, the sampling device 1 also includes an outer casing 18, with an inlet at the top of the outer casing 18 and a bracket 17 installed inside the outer casing 18. A side door 181 is provided on one side of the outer casing 18, and an observation window 182 is provided on the side door 181. The outer casing 18 is provided with a side door 181 and an observation window 182 to facilitate the retrieval of internal items and the observation of the internal condition.

[0029] Please refer to the following steps when using it:

[0030] 1. Preparation before sampling: Place an appropriate amount of degreased cotton 132 into a double-ball drying sampling tube 13, place it in a constant temperature drying oven 3, dry it at 105-110℃ for about 30 minutes, then cool it to room temperature, and then weigh it in a weighing device 2, accurate to 0.1mg, and record the weight. Repeat the above steps until the difference between two adjacent readings is less than 1mg, and record the reading W1 of the last weighing. The double-ball drying sampling tube 13 is ready for use.

[0031] 2. Sampling Operation: Open sampling valve 11 to release gas for 1-2 minutes, then close the valve. Connect the connecting pipe 12 to sampling valve 11 and check the system's airtightness. Check if the flow meter and thermometer meet the requirements, and record the flow meter reading V1 at this time. Open sampling valve 11 to take a sample. The sampling time should be determined according to the amount of dust in the gas, ensuring that the weight gain of the double-ball drying sampling tube 13 is not less than 3mg and not more than 500mg. Record the gas pressure P and temperature t, close the sampling tube valve, and record the flow meter reading V2.

[0032] 3. Analytical Procedure: Wipe the exterior of the double-sphere drying sampling tube 13 clean and place it in a constant temperature drying oven 3 at 105-110℃ for 1-2 hours (depending on the moisture content). After cooling to room temperature, weigh it. Repeat the above steps, with each subsequent drying time being 30 minutes, until the difference between two consecutive readings is less than 1 mg. Record the reading W2 from the last weighing.

[0033] 4. Substitute the values ​​into the following formula to calculate the dust content.

[0034]

[0035] In the formula: (W2-W1) is the sample weight, mg; (V2-V1) is the volume of gas flowing through the sampler, L; t is the gas temperature passing through the flow meter, °C; P is the gas pressure at sampling time, kPa; P0 is the saturated vapor pressure of water at t °C, kPa; D is the flow meter correction coefficient.

[0036] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A system for directly sampling and weighing dust content in exhaust gas, characterized in that: The system includes a sampling device, a weighing device, and a constant-temperature drying oven. The sampling device includes a sampling valve, a connecting pipe, a double-ball drying sampling tube, a pressure transmitter, a temperature sensor, and a gas flow meter. The sampling valve is installed at the sampling point on the exhaust gas main pipe. One end of the connecting pipe is detachably connected to the sampling valve, and the other end is connected to the exhaust gas treatment device. The connecting pipe is sequentially equipped with a pressure transmitter, a temperature sensor, a gas flow meter, and a double-ball drying sampling tube. The double-ball drying sampling tube is open at both ends and filled with degreased cotton. The weighing device is used to weigh the double-ball drying sampling tube, and the constant-temperature drying oven is used for temperature control of the double-ball drying sampling tube and to maintain a dry environment.

2. The exhaust gas dust content direct sampling and weighing system according to claim 1, characterized in that: It also includes a data processor, which has a built-in formula for calculating dust content. The data processor is equipped with several interfaces, which are respectively connected to the corresponding weighing device, pressure transmitter, temperature sensor and gas flow meter.

3. The exhaust gas dust content direct sampling and weighing system according to claim 2, characterized in that: The data processor is equipped with a manual input button, which can be used to input or modify data parameters.

4. The exhaust gas dust content direct sampling and weighing system according to claim 1, characterized in that: The double-sphere drying sampling tube has two spherical receiving cavities in the middle, and the spherical receiving cavities are filled with degreased cotton.

5. The exhaust gas dust content direct sampling and weighing system according to claim 1, characterized in that: The double-ball drying sampling tube has sealing plugs at both ends, and the connecting tube penetrates the sealing plugs to communicate with the inside of the double-ball drying sampling tube.

6. The exhaust gas dust content direct sampling and weighing system according to claim 1, characterized in that: The sampling device also includes a support, on which an inclined placement part is provided, and the double-ball drying sampling tube can be placed on the placement part and is inclined.

7. The exhaust gas dust content direct sampling and weighing system according to claim 6, characterized in that: The sampling device also includes an outer casing, with an inlet at the top of the outer casing and a bracket installed inside the outer casing; a side door is provided on one side of the outer casing, and an observation window is provided on the side door.

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